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