Perhaps you should try some spelling variations:
international ecological » international economics, international economic, international economies
"international political economic surveys" » "international policy economic surveys", "international political economy surveys", "international political economic survey"
"International ecological economics services" » "International ecological economic services", "International ecological ecological services", "International ecological economics studies"

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