Perhaps you should try some spelling variations:
"international political economic surveys" » "international policy economic surveys", "international political economy surveys", "international ecological economics surveys", "international political economic studies", "international political economic systems"
"international wages economic theories" » "international pages economic theories", "international waters economic theories", "international water economic theories", "international wages economic theory", "international wages economics series", "international changes economic theories", "international states economic theories"

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