Perhaps you should try some spelling variations:
"international ecological economics studies" » "international technological economics studies", "international psychological economics studies", "international economics economics studies", "international ecological economics series", "international ecological economics study", "international ecological economy studies"
international political » international policy
"International political economic studies" » "International political economy studies", "International policy economic studies", "International political economic status"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("International political economic studies") or ("international ecological economics studies"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("International political economic studies") OR ("international ecological economics studies")).
• Removing quotes may allow a broader search: (( International political economic studies ) or ( international ecological economics studies )).
• Adding a wildcard symbol may retrieve word variants: (("International political economic studies") or ("international ecological economics studies"))*.