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

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 political economy series") OR ((((("international political economic studies") OR ("international political economic systems"))) OR ("international political economics series"))))~.
• Removing quotes may allow a broader search: (( international political economy series ) or ((((( international political economic studies ) or ( international political economic systems ))) or ( international political economics series ))))~.
• Adding a wildcard symbol may retrieve word variants: (("international political economy series") or ((((("international political economic studies") or ("international political economic systems"))) or ("international political economics series"))))*.