Perhaps you should try some spelling variations:
international ecological » international economics, international economic, international economies
"international political economic surveys" » "international policy economic surveys", "international political economy surveys"
"International ecological economics studies" » "International ecological economic studies", "International ecological economy studies", "International ecological ecological studies"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("international political economic surveys") or ("International ecological economics studies"))~.
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• Removing quotes may allow a broader search: (( international political economic surveys ) or ( International ecological economics studies )).
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