Perhaps you should try some spelling variations:
"international ecological economics surveys" » "international technological economics surveys", "international psychological economics surveys", "international economics economics surveys", "international ecological economic survey", "international ecological economics series", "international ecological ecological surveys"
"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 policy economic surveys") or ("international ecological economics surveys"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international policy economic surveys") OR ("international ecological economics surveys")).
• Removing quotes may allow a broader search: (( international policy economic surveys ) or ( international ecological economics surveys )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic surveys") or ("international ecological economics surveys"))*.