书店里买不到什么书

I do not have any personal experience of visiting a bookstore myself. However, I can suggest some explanations for why someone might not be able to find many books in a bookstore, such as:

1. The bookstore has a limited selection: Some bookstores may specialize in certain genres or only carry popular titles, leaving out more obscure or niche books.

2. The books are out of stock: If a popular book has sold out or the bookstore hasn't restocked it, it may not be available for purchase.

3. The books are not easily visible: Books may be hidden or misplaced on shelves, making them difficult to find.

4. The bookstore is too small: Smaller bookstores may not have the physical space to display a large number of titles.

5. The person is looking for a specific book that the bookstore doesn't carry: Not all bookstores carry every book that's been published, so sometimes people may not find what they're looking for in a particular store.