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Select the most important 2-3 terms related to your topic. Put the word AND between each new term; this tells the database to look for resources with ALL your terms.
affordable care act AND seniors
Use quotation marks ( " " ) around phrases (two or more words); this tells the database to look for the words in that specific order.
"affordable care act" AND seniors
Use an asterisk ( * ) to find multiple endings of one word. Using senior* as a search term will include results that refer to senior and seniors.