Try a keyword search. Once you find a book that is relevant to your topic, click on the title of that book, then look for Subjects in the full record of that book to help you find "more like this."
Sample keyword search:
leads to linked subject terms and more books on this topic:
Not finding enough, or found an item that's checked out? Search WorldCat and request a copy.
Inventing English: A Portable History of the Language by 
English in the Middle Ages by 