Boolean operators such as AND (narrows) and OR (broadens) are used to join search terms together.
Use OR to broaden your search. For example, if you search advertising OR commercials, you will find articles that include both terms.
In contrast, use AND and NOT to narrow your search. For example, if you search advertising AND commercials, you will only find articles that include both terms.
And, if you search advertising NOT commercials, you will find articles that include the word advertising except for those that also include the term commercials. In Google, use a minus sign instead of NOT (e.g. advertising -commercials).
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