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 political economic studies" » "International political economy studies", "International policy economic studies", "International ecological economics studies", "International political economic status"

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