Talk to Books is not a traditional search engine. It does not use keywords or metadata to find the best matches for your query. Instead, it uses semantic analysis to understand the meaning and intent of your query, and then compares it to the sentences in the books. It returns the passages that have the closest semantic similarity to your query, regardless of whether they contain the exact words or not.
Talk to Books is a free service provided by Google Books. You can access it at https://books.google.com/talktobooks/. You can also learn more about the AI system behind it at Google AI Semantic Experiences. Talk to Books is an experimental project that is still in development, so you may encounter some errors or unexpected results. However, it is also a fun and innovative way to engage with books and expand your knowledge.