What’s an alternative for Google Scholar but for books?

I’ve been having a hard time searching for primary literature for a thought paper I’ve been working on. When I say primary literature, I meant books, essays, encyclopedias, and whatnot—very different from journal articles usually found in the search engine.

I’m just asking for an engine or website that basically functions like Google Scholar but provides book titles, chapter titles, or even just page content as the results of a search. Thanks!