There are two ways:
Go to some better bookstores first and buy a chronology of Lu You's poems (such as Xinhua Bookstore, there is definitely no one). Go to the bookstores and ancient books bookstores in your city. There are several good publishing houses, such as Ancient Books Publishing House, Zhonghua Book Company, China People's Literature Publishing House and Nanjing University Publishing House. These publishing houses have published quite a few books on these literary studies, but they may not be able to buy them. I don't think this method is feasible. )
Second: Go to the library in your city. For example, if you are in Zhejiang, go to the Zhejiang Library, and if you are in Beijing, go to the National Library. Some materials can of course be found in the library, and this method is more feasible.
I used to find a lot of time to create ancient poems, but I couldn't buy books, so I searched on Dangdang. Some books don't exist at all, and even some books used to exist, and now they are not reprinted. I've also been to Confucius Old Books and found many good ones, but now some versions are more expensive because they are no longer printed.
I hope I can help you, but don't look for it online. I looked for it before, but I couldn't find it.