Search a variety of databases as no single database will cover all of the literature. Individual library databases may provide their own search tips in the help menus - this is a good place to start if you are unfamiliar with the database.
Remember to plan your strategy before you start searching as this will help to minimise irrelevant results.
Whie Quantitative research is not directly indexed in PubMed it can be located by choosing specific subject terms. Examples include:
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Combine searches with topic Subject Headings to locate quantitative research.