Enter keywords in the search engine, and then click "Search", and the system will return the query results soon. This is the simplest query method, which is convenient to use, but the query result is inaccurate and may contain a lot of useless information. }
2. Use double quotation marks ("")
Adding double quotation marks (half-width, as well as other symbols to be added below) to the keyword to be queried can realize accurate query. This method requires accurate matching of query results and excludes evolutionary forms. For example, if you type "telex" in the text box of a search engine, it will return the website with the keyword "telex" in the webpage, instead of returning the webpage such as "telephone fax".
3. Use the plus sign (+)
Using a plus sign before a keyword is equivalent to telling the search engine that the word must appear on the web page of the search results. For example, entering "+computer+phone+fax" in a search engine means that the content to be searched must contain three keywords: "computer, phone and fax".
Step 4 Use the minus sign (-)
Using a minus sign in front of a keyword means that the keyword cannot appear in the query results. For example, if you enter "TV Station-CCTV" in the search engine, it means that "CCTV" must not be included in the final query results.
5. Use wildcards (* and? )
Wildcards include an asterisk (*) and a question mark (? ), the former means that the number of matches is not limited, and the latter means that the number of matched characters is limited, which is mainly used in English search engines. For example, if you enter "computer*", you can find words such as "computer, computers, computerized, computerized" and enter "comp? Ter ",you can only find words like" comparator, comparator, competitor ".
6. Use Boolean retrieval
The so-called Boolean retrieval refers to a query method that expresses the logical relationship between keywords through standard Boolean logical relationship. This query method allows us to input multiple keywords, and the relationship between each keyword can be expressed by logical relational words.
And, called logical and, is connected by AND, which means that the two words it connects must appear in the query results at the same time. For example, entering "computer and book" requires that both computers and books must be included in the query results.
Or, called logical OR, means that either of the two linked keywords can appear in the query results. For example, if you enter "computer or book", you can only ask for the computer, or only the book, or both the computer and the book in the query results.
Not, called "not" logically, means that among the two connected keywords, the second keyword should be excluded from the concept of the first keyword. For example, if you enter "cars instead of cars", you need to include cars in the query results, but not cars at the same time.
Near means that the word spacing between two keywords cannot exceed n words.
In the actual use process, we can use all kinds of logical relations comprehensively and flexibly to make more complicated queries.
7. Use parentheses
When two keywords are connected by another operator and you want to list them as a group, you can put parentheses around the two words.
8, using meta-word retrieval
Most search engines support the function of "meta-words". According to this function, users can put meta-words in front of keywords, so that they can tell search engines what specific features you want to retrieve. For example, if you enter "Title: Tsinghua University" in a search engine, you can find a page with Tsinghua University in the title. Add "domain:org" after the typed keyword, and you can find all websites with org suffix.
Other metacharacters include: image: for retrieving pictures, link: for retrieving pages linked to the selected website, and URL: for retrieving pages with a certain keyword in the address.
9. Case-sensitive
This is a problem that should be paid attention to when retrieving English information. Many English search engines allow users to choose whether case-sensitive keywords are needed, which is very helpful for querying proper nouns. For example, the web refers to the World Wide Web or the World Wide Web, and the Web refers to the spider web.
Yahoo China
First, enter the keyword you need in the search field and press the search key, YAHOO! It will automatically search categories, websites, database information and news databases, and list the information found for you accordingly. The order of listing materials is based on the matching degree with keywords, and the arrangement of news materials also integrates the factors of update time. In addition to this simple query method, Yahoo! It also supports advanced retrieval methods. If you want to use this kind of retrieval, you must first understand its specific grammar:
1. Use double quotation marks to query the website. For example, after entering "computer music", only websites with computer music will appear, and websites containing "computer and MP3 music" will be ignored. Please note that double quotation marks must be half-width characters.
2. Add letters to specify the paragraphs where keywords appear. If you add "t:" before the keyword, the search engine will only query the website name; And adding "u:" before the keyword, the search engine will only query the required URL.
3. Use "+"and "-"to limit the results, and keywords with "+"must appear in the results; Keywords marked with "-"shall not appear in the query results.
Sohu
The upgraded Chinese Sohu retrieval system has added new functions to solve the problem of Chinese word segmentation. For example, after typing "computer", websites with words like "electronic" and "brain" are also retrieved. But now it can be accurately positioned, saving users' time and energy. The system also has a user dictionary, which allows you to define the name, part of speech and the corresponding big five fonts of a word and add the word to the thesaurus. The specific usage method is: enter the keyword to be queried in the search text field, and press the "Search" button, and Sohu Chinese retrieval system will retrieve the results from the following four aspects:
Sohu Classification: Query qualified classification categories.
Sohu website: query the websites included in the qualified Sohu database.
Global Web pages: Search qualified Web pages on the Internet.
Sohu News: Inquire about qualified Sohu news content.
The factors that affect the retrieval results are the location and frequency of keywords on the page and the part of speech of keywords themselves. For news, you need to refer to the date of its update. General news retrieval only contains the content of nearly three months. Like Yahoo, Sohu also contains its own search grammar:
1. Add AND between two keywords, indicating that these two words are "and" logical relationship, and the search result will be a page containing these two keywords.
2. Adding OR between two keywords means that the two words are logical relations of "OR", and the search results are more and wider. Any page that contains either of these two keywords is very suitable for querying ambiguous content.
Sina search
Sina search is currently divided into 15 categories, and there are more than 1 10,000 sites in the detailed information of110,000. Sina's search order. The searchers of com are: directory search, website search and full-text web search.
1. Sina search engine allows single-word or multi-word queries in the keyword query box, and there are many symbols indicating the relationship between "and", such as spaces, commas, plus signs and&.
2. Sina search engine also includes advanced search methods: adding "t:" before keywords means only searching website titles; Add "u:" before the keyword to indicate the URL of the search website. In addition, Sina search can better support digital query.
China is exciting.
At present, the Chinese Excite search engine only searches web pages, which is convenient for netizens who want to find information, but useless for those who want to find websites. Nevertheless, I still want to introduce Chinese Excite in detail, because it is the most comprehensive network search engine at present. There are * * * 2 million web pages collected here, and five "high-performance search platforms" are provided to help searchers find them. The most distinctive thing is that the search results are sorted according to the relevance of your questions. Generally speaking, the higher the ranking, the higher the relevance. If you find that a search result meets your search requirements, click the "Search for more documents similar to this page" button, and the Excite Chinese search engine will search for more similar pages. If you search with specific interrogative words, you can find more documents you want to find. For example, computer magazines can retrieve more information about computers than newspapers and magazines. Sometimes, many search results come from the same website, but they are scattered in different directories. As long as you click the "Display Search Results by Website" function key, the search results will become a directory arranged by websites. Under the name of each website, all the pages related to the problem in the website are listed according to the degree of relevance. Using the "high-performance retrieval platform", you can also search for more related documents as quickly and accurately as a professional information expert. We can also specify our own retrieval databases (all Chinese web databases, China web databases, Hongkong web databases, Taiwan Province web databases, Singaporean web databases, and Western Web pages) to control the number and display mode of retrieval results, and we can conveniently use all advanced retrieval functions. The most commonly used technologies in retrieval are as follows:
1. Enter keywords, and Excite's search engine will customize and retrieve documents that meet the information needs.
2. "phrase retrieval" is also called "perfect matching retrieval", and the retrieval result must contain the same character string (including order) as the question type. When searching for a specific document, we should use double quotation marks for phrase retrieval.
3. Add "+"before the search word or word to indicate that the word or word must appear in the search results; Adding a "-"before a search term means that the word cannot appear in the search results. It's very important to use. There should be no space between "+"and "-"and the search term after them.
4. Use Boolean values to retrieve symbols. Boolean search symbols include AND (the search result must contain all keywords connected by AND), OR (the search result must contain at least one keyword connected by OR), not (the search result cannot contain the keyword immediately after NOT) and () (indicating that the search result must contain all the entered keywords). These symbols must be capitalized with a space before and after them. If Boolean retrieval is used, the Excite retrieval engine will automatically stop the retrieval function of concept analysis and retrieve the web pages that match the keywords.
The above introduces several most commonly used search engine using skills and methods. I believe that through the above study, most Internet users can use these search engines correctly and efficiently.