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