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Try synonyms and alternate spellings, i.e. cancer OR carcinogen OR carcinogenic
Use quotes to search for an "exact phrase"
Use an asterisk (*) for truncation, i.e. educat* = educate, educated, education
Try searching different fields i.e. Title, Abstract, Subject etc.
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Look at the citing and cited references to find more articles
Look at the conclusion for directions for future research
Peer reviewed (or refereed) journals have been reviewed by a panel of subject experts, a researcher's "peers." Peer reviewers scrutinize articles for significance, relevance, sound research design, accurate presentation, and clarity before they are accepted for publication.
Many databases allow searches to be limited to peer-reviewed journals. Look for a limit box to check for peer-reviewed or refereed. You can also use Ulrich'sIntermational Periodicals Directory to check a journal's peer-reviewed status. Look for a referee jersey icon to indicate that a journal is peer-reviewed.