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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("international economics economy studies") or ("international political economic theories"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international economics economy studies") OR ("international political economic theories")).
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