Perhaps you should try some spelling variations:
"international politics economy series" » "international relations economy series", "international political economy series", "international politics economics series"
"international political economics series" » "international political economies series", "international political economits series", "international politics economics series", "international political economys series"
"international political economic series" » "international political economy series", "international political economies series", "international political economic theories", "international political economic surveys"
"international political economic studies" » "international political economy studies", "international political economic success", "international political economic survey"

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

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