Use Boolean logic to narrow, broaden, or refine the search results.
Using Library of Congress subject headings can help narrow or broaden your search as well as identify specific key words that will be using conducting your research. Move from a broad to a specific topic. Review the "Subject of Works" for historical/foundational resources.
Science Direct includes a topical index which separates topics by field. Each entry includes excerpts from scholarly articles, books, books chapters, encyclopedias, and other resources produced by Elsevier. If you locate a pertinent resource, search for the title on the ZSR library website. If needed, request access to the resource using interlibrary loan.