Perhaps you should try some spelling variations:
"international political economic theories" » "international political economy theories", "international policy economic theories", "international political ecology theories", "international political economic theory", "international political economics theory"
"international politics economics series" » "international policy economics series", "international policy economic series", "international politics economy series", "international politics economics social", "international politics economics industries"

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 theories") or ("international politics economics series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economic theories") OR ("international politics economics series"))*.
• Removing quotes may allow a broader search: (( international political economic theories ) or ( international politics economics series ))*.