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

Try widening your search to All Fields.

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