When you start with keywords and combine them using the word AND, OR and NOT, you are using Boolean Operators.
AND narrows your search - useful if you get too many results. The more terms you connect with and, the fewer your results!
OR expands your search - useful if you get too few results. Try using synonyms with or.
NOT excludes words from your results. Use sparingly! When you exclude a word, you may be eliminating relevant articles in which the word appears.
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