Perhaps you should try some spelling variations:
"international africa's economic studies" » "international african economic studies", "international prices economic studies", "international airways economic studies", "international africa economic studies", "international china's economic studies", "international africa's economic status"
"international policy economy series" » "international poverty economy series", "international prices economy series", "national policy economy series", "international policy economic series", "international polish economy series", "international politics economy series", "international policy economics series"

Try widening your search to All Fields.

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