Databases can contain a combination of full text articles (ready to read online) and/or citation information about articles, book chapters, books, or other resources.
When searching, skimming items you come across in your results can be a key way to evaluate whether they will be a useful source for your writing. See UNC Chapel Hill's guide to skimming for tips.
Try a keyword search. Once you find a book that is relevant to your topic, use the subject headings of that book to help you find "more like this".
Not finding enough, or an item checked out? Search WorldCat and request a copy.