If it's not online, you can't find it on Google. And that's why Google decided to start scanning library books. It's still just a beta search (that means it's still being tested), but if you enter the word "book" into the search field followed by "sartre" or "wonderland" or "openDemocracy" you can click to see the actual pages in books that mention those words. Look for the colourful book icon at the top.

Google is working with libraries at the University of Michigan, Harvard University, Stanford University, The New York Public Library, and Oxford University, so a lot of the texts on offer are academic ones. They're also working with several publishers. If the book is in the public domain you can sometimes read the whole thing online. Otherwise Google has provided handy links to where you can buy a copy.