How could he find a book without knowing its title?

If you don't know the title of a book, you can try to find it by: 1 Search and then search for related books. Many authors publish many books, so you can find related books by the author's name. Search keywords: If you know some keywords such as the protagonist's name, plot summary, a certain location, etc., you can enter these keywords into the search engine to find related books. 3. Search for publication information: You can search for publication information in the library or online bookstore, or check the book's introduction and reviews to understand the type and content of the book. 4. Search for recommendations: You can search for relevant book recommendations on social media or read reviews and recommendations from other readers on novel forums or websites. 5. Other books: If there are other books that you already know, you can look at their plots and content to get inspiration from them and create your own novel.