Perhaps you should try some spelling variations:
international policy » international poverty, international prices, national policy
"International policy economic systems" » "International policy economic sectors", "International policy economic status"
"international political economy series" » "international political economics series"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("International policy economic systems") or ("international political economy series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("International policy economic systems") OR ("international political economy series")).
• Removing quotes may allow a broader search: (( International policy economic systems ) or ( international political economy series )).
• Adding a wildcard symbol may retrieve word variants: (("International policy economic systems") or ("international political economy series"))*.