Developing appropriate keywords/search terms is an essential part of research. First, break your topic into components. Develop a list of synonyms and alternative terminology for each component. Think about broader and narrower concepts and word variants. What words can you exclude?
Topic: Image of African American Women in Advertising
image(s) or stereotyp(es)(ing) or depict(ion) or portray(al)...
african american(s) or black(s) or minorit(y)(ies)
women or gender
advertis(e)(ing) or media
Remember to be creative with your terminology! More examples:
people of color and environmental activism*
environmental justice and hazardous waste*
Topic: Image of African American women in advertising
potentially relevant disciplines:
African American Studies
Gender and Women's Studies