An advanced search builds into the multi-lines the intention of narrowing, of refining. Each line is a narrower aspect of your topic. You can also brainstorm alternate terms to cast a wider net. The screenshot below has a strategy that would work in any advanced search.
OR broadens your search by searching multiple related terms at once
AND narrows your search by allowing you to add lines of narrower aspects
OPEN this image in a new tab to see larger.
Note that the advanced search for our all in one tool on the main library homepage is more finicky (kinda behaves like google). Put phrases in quotation marks and capitalize your ORs.
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