Perhaps you should try some spelling variations:
"international policy economic surveys" » "international poverty economic surveys", "international prices economic surveys", "national policy economic surveys", "international policy economic studies", "international policy economic systems"
"international political economic services" » "international political economy services", "international ecological economics services", "international political economics series", "international political ecological services", "international political economic studies"

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