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# Complex keyword combinations

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Explains how to use parentheses in Boolean searches, with Venn diagrams.

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### Complex keyword combinations

1. 1. Complex Keyword Combinations<br />the power of parentheses<br />
2. 2. You get both dogs and cats.<br />dogs AND cats<br />
3. 3. You get either dogs or cats, or both.<br />dogs OR cats<br />
4. 4. Now you have to use parentheses because you are using both AND and OR. <br />You get birds, plus either dogs or cats<br />birds AND (dogs OR cats)<br />
5. 5. You get either birds and dogs together, or cats and fish together.<br />(birds AND dogs) OR (cats AND fish)<br />
6. 6. Now you're going to have nested parentheses - one set inside another. <br />You get either cats, or birds and dogs together, but not fish. <br />(cats OR (birds AND dogs)) NOT fish<br />
7. 7. Can you guess what the parentheses are for?<br />Hint: If you remember anything from algebra, think “Order of Operations.”<br />
8. 8. You’re using the parentheses to tell the database how to group the keywords. That lets it perform a set of calculations, which have to be done in a certain order. <br /> Without the parentheses, you‘d get only a fraction of the good search results, with a lot of bad ones mixed in.<br />