You can quickly determine whether a book is likely to help you by skimming the table of contents and looking up keywords in the index to locate relevant pages. Use the bibliography to locate related books or articles.
Use subject headings to create a narrow set of search results according to the major subject of your study, then cross-reference those results with additional keywords derived from your topic. Your research may benefit from sources carrying different subject headings, however, so it's best to perform a subject search after exhausting a broader keyword-based approach.