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

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("chickens studies in american politics") OR ("chickens studieson in american politics"))) OR ("thickness studies in american politics")).
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• Removing quotes may allow a broader search: (((( chickens studies in american politics ) OR ( chickens studieson in american politics ))) or ( thickness studies in american politics )).
• Adding a wildcard symbol may retrieve word variants: (((("chickens studies in american politics") OR ("chickens studieson in american politics"))) or ("thickness studies in american politics"))*.