Keywords allow you to construct a search that reflects multiple issues in your research question. Building sets of related concepts and looking for their overlaps gives you more relevant and precise results. This approach is also called Boolean searching using the operators (AND, OR, NOT).
For example, a search for economic* AND academ* will return items that contain both terms:
academ* OR universit* OR college* OR "higher education" makes a larger set concerning college and university education:
Resnais NOT Holocaust returns items that contain "Resnais" but not "Holocaust":
Phrase searching:
Enclose phrases in quotations marks. This is an important strategy for getting exact results when searching phrases (e.g., "american psychological association") or conducting known-item searches for titles.
Nested Searching:
When pairing two or more keywords with another keyword, it is important to "nest" the related terms within a larger Boolean search.For example, (research OR scholarship) AND humanities will return results for humanities and any one (or both) of the parenthetical terms.
(Many catalogs or databases will have an "advanced search" option, which provides multiple search boxes to facilitate nested Boolean searching.)
Truncation and Wildcards:
Most catalogs and databases enable users to search variations of keywords by using truncation (*) or wildcard (e.g., ?, $, !) symbols.
For example, one could search for politic* to find poltic, politics, political, politician, and so on.
Wildcard searching works similarly: a search for wom?n will return results for both woman and women.