Perhaps you should try some spelling variations:
"international political economic studies" » "international policy economic studies", "international ecological economics studies", "international political economic status"
"international political economy theories" » "international policy economy theories", "international political economic theories", "international political economics theories", "international political economy series"

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 studies") or ("international political economy theories"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economic studies") OR ("international political economy theories"))*.
• Removing quotes may allow a broader search: (( international political economic studies ) or ( international political economy theories ))*.