1, some very new books: except in special circumstances, almost all new books have to be pre-ordered online in advance to get the latest version of the book.
2. Books with special themes, such as professional books, ancient books or some collections, are unlikely to be found in bookstores. In most cases, you should go to a professional ancient book collection store or buy it online.
3. Shrink printed books: Shrink printed books themselves have not been officially published, and general bookstores can't stock them, so they can only go to professional bookstores or specific online purchases.
4. Foreign language books: Many foreign language books also need to be purchased in professional bookstores or special online, and it is difficult to find them in bookstores under normal circumstances.
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