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