Perhaps you should try some spelling variations:
"international policy economics series" » "international poverty economics series", "international prices economics series", "national policy economics series", "international policy economic series", "international politics economics series", "international politik economics series"
"international political economy theory" » "international political economic theory", "international political 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 economy theory") or ("international policy economics series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economy theory") OR ("international policy economics series"))*.
• Removing quotes may allow a broader search: (( international political economy theory ) or ( international policy economics series ))*.