Perhaps you should try some spelling variations:
"international ecological economic surveys" » "international economics economic surveys", "international economic economic surveys", "international political economic surveys", "international ecological economics surveys"
"international banks economic theories" » "international bank economic theories", "international best economic theories", "international business economic theories", "international banks economic theory", "international bank's economic theories", "international wages economic theories"

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