Keep in mind:
Using more keywords produces a more specific set of results.
When looking at your search results select the title of the resource to view details of an abstract, chapter headings or a contents page of the item, to help you judge its relevance.
Search results will initially be unfiltered, you will find items including journal articles, newspaper articles, ebooks, and even video files.
A simple search of one or two words may return tens of thousands of results; use the refine options available to improve the returned results.
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Comprehensive searches should be done in subject specific databases.