Perhaps you should try some spelling variations:
"american and comparative environmental policy" » "american and corporate environmental policy", "american and cooperative environments policy", "american and competitive environment policy"
"American and competitive environmental politics" » "American and competitive environment politics", "American and competitive environments politics", "American and competitive enironment politics", "American and competitive environmental pollution", "American and competitive environmental physics"

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: (("american and comparative environmental policy") OR ("American and competitive environmental politics")).
• Removing quotes may allow a broader search: (( american and comparative environmental policy ) or ( American and competitive environmental politics )).
• Adding a wildcard symbol may retrieve word variants: (("american and comparative environmental policy") or ("American and competitive environmental politics"))*.