Perhaps you should try some spelling variations:
"international ecological economics theories" » "international technological economics theories", "international psychological economics theories", "international economics economics theories", "international ecological economic theories", "international ecological economics series", "international ecological economics theory"
"international policy economic surveys" » "international poverty economic surveys", "international prices economic surveys", "national policy economic surveys", "international policy economic studies", "international policy economic systems"

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 ecological economics theories") or ("international policy economic surveys"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international ecological economics theories") OR ("international policy economic surveys")).
• Removing quotes may allow a broader search: (( international ecological economics theories ) or ( international policy economic surveys )).
• Adding a wildcard symbol may retrieve word variants: (("international ecological economics theories") or ("international policy economic surveys"))*.