(cats OR dogs OR pets) AND intelligence
- This will search for everything in the brackets, then outside the bracket.
- This will return results that contain
- cat and dog and pet and intelligence
- cat and dog and intelligence
- cat and pet and intelligence
- dog and pet and intelligence
- cat and intelligence
- dog and intelligence
- pet and intelligence
(anxiety OR depression) AND (test OR measure)
- This will everything in the brackets, then tie it together
- This will return results containing
- anxiety and depression and test and measure
- anxiety and test and measure
- anxiety and test
- anxiety and measure
- depression and test
- depression and measure
