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 policy economic securitys", "international policy economic studiess", "international policy economic successs"
"international political economic survey" » "international political economy survey", "international ecological economics survey", "international political economic security", "international political economic studies", "international political economic success"

You may be able to get more results by adjusting your search query.

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