The National Academies Discovery Engine search tool
The enhanced Discovery Engine search tool of the National Academies provides open access to a broad range of academic content (with lots of encouragement to buy a hard copy) that you can read online. A search on the term “conflict resolution” found 50 publications, with the ability to “find more like this” for items that most closely match your search terms. Another nice feature is the Research Dashboard, which pulls key terms from the current found item, providing you with ways to combine these terms in various ways, or to drill deeper into the book using terms found for you. You can also paste a few pages of a text that you yourself are writing into their Reference Finder tool to find books from The National Academies collection that might be good references or to extract the key terms found in your text for use constructing your own search later.