When you find a relevant article, make sure to look at the subject terms listed. Think of these like hashtags on Instagram. You can then either click on the hyperlinks to find articles with those same tags or use them in a keyword search to find other potentially relevant items.
Many databases also have a thesaurus feature that can help you look up subject terms a particular database uses.
Visit the "Where to Find Books+" page of this guide to learn about the Library of Congress Subject Headings.
Below are the hyperlinked terms (called topics in the JSTOR database) listed in Dr. Martin's article “'More Power to Your Great Self': Nigerian Women’s Activism and the Pan-African Transnationalist Construction of Black Feminism." When you visit the live article, the topics are on the left side of the screen.
This image shows the difference between keywords and subjects. (Image needs to be made accessible to screen readers).