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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("international policy economic studies") or ("international political economic theories"))~.
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