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

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