Perhaps you should try some spelling variations:
"chickens studies in american politics" » "chickens studieson in american politics", "childrens studies in american politics", "chicano studies in american politics"
"chickens studies in african politics" » "chickens studieson in african politics", "childrens studies in african politics", "chicano studies in african politics"

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: (((("chickens studies in american politics") OR ("chickens studies in african politics"))) OR ("thickness studies in american politics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"chickens studies in american politics\") OR (\"chickens studies in african politics\"))) or (\"thickness studies in american politics\"))".
• Removing quotes may allow a broader search: (((( chickens studies in american politics ) OR ( chickens studies in african politics ))) or ( thickness studies in american politics )).
• Adding a wildcard symbol may retrieve word variants: (((("chickens studies in american politics") OR ("chickens studies in african politics"))) or ("thickness studies in american politics"))*.