Please follow this link below for excellent tips on how to search the databases using truncation and wildcard symbols and proximity searches.
Ovid Nursing Full Text PLUS Tutorial for Basic Search
If you got too few results try one or more of these tips:
Use an OR with synonyms to broaden your search
Consult a thesaurus or index for more search terms
Reduce the number of concepts
Use more general terms
Use truncation to get variations or alternate spellings of your term
Use the broadest search possible (usually Keywords in most databases)
Check your spelling
Check to see if you used AND and OR properly
Check to see if you are using the best database for your topic
If you get too many results try one or more of these tips:
Use an AND to narrow your search
Use more precise terms
Use subject headings instead of Keywords
Consult a thesaurus or index for more narrower terms
Remove truncation
Search in a specific field, such as the Subject or Title field, instead of searching Keywords
Use limits such as language, years or document type.