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

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

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