Fabio Said has a post on how to create your own library in Google Books for terminology search. The post is even in English: Searching terminology with Google Books
The trick is quite simple: if you have a Google account, you can build a digital “library” from books you find on Google Books. Whenever you find an interesting book, you can add it to your custom library, which automatically makes your books searchable. But that, of course, will only work if the books you select have preview capabilities, i.e. if they can be viewed entirely or with limitations.
More there, including a link to Fabio's own Google library.
I am using Google Books more and more for terminology research, so I will be looking into this.