Perhaps you should try some spelling variations:
"African studies services" » "African des services"
"african studies theories" » "african studies theory", "african des theories", "african studies three", "american studies theories"
"African studies series" » "African studies species", "African studies studies", "African studies service"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("African studies series") OR ("African studies services"))) OR ("african studies theories")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"African studies series\") OR (\"African studies services\"))) or (\"african studies theories\"))".
• Removing quotes may allow a broader search: (((( African studies series ) OR ( African studies services ))) or ( african studies theories )).
• Adding a wildcard symbol may retrieve word variants: (((("African studies series") OR ("African studies services"))) or ("african studies theories"))*.