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 surveys", "international ecological economic survey", "international ecological economics series"
"international political economic theories" » "international policy economic theories", "international political economy theories", "international political economic theory", "international political economics series"

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