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Think critically about what kinds of contents different databases include, and adapt your search terms accordingly
When using a given academic database, do a test search, open a record and see what descriptive language (metadata), the catalogers and indexers use to organize information. Adjust your terms accordingly.
Use "" to search a complete, unbroken phrase, e.g. "Ni una más"
In many databases, you can use * to stand in for the multiple possible endings of a word, e.g. mujer* (searches mujer and mujeres); negr* searches any word beginning with negr (negro/a/os/as/itud...)
Use Boolean operators like AND and OR to build a search. E.g. (Brazil OR Brasil) AND (transgender OR transgênero)
Remember that databases run out of the U.S. will have metadata (i.e. descriptions) in English, even if the text, title, etc. is in Spanish or Portuguese, so it is important to search in multiple languages
Due to your project topics, here are some keywords you might want to try. Remember you can search multiple languages by enclosing the keywords in parenthenses like this: (black OR negr*) AND (transgender OR transgênero).