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UBC Library Informatics for Nursing

1.10 Constructing a search using parentheses

Use parentheses for clarity in your search statement.

Enclose words connected with OR in parentheses -- especially if you're using AND in the same search.

For example, the following search will find items about fleas in either cats or dogs: fleas and (cats or dogs)

Here's what is looks like on PubMed. Note the differing results and meaning based on how you use the parentheses: