Try pairing your chosen topic with various themes or concepts. See examples below.
"voting rights" AND "black electorate"
"voter ID laws" AND "voter disenfranchisement"
"Voting Rights Act"
"Frank v Walker"
"electoral advocacy"
"voter advocacy"
"voter wars"
Adding quotation marks around a phrase "tells" the database/search engine to find results with that exact phrase. Placing an asterisk (*) at the end of a root word indicates to the system that you are looking for various word endings, e.g. activis* would retrieve activism or activist.
Example Search in JSTOR