Perhaps you should try some spelling variations:
"international politics economy series" » "international relations economy series", "international politics economics series"
"international political economics series" » "international political economies series", "international political economits series", "international politics economics series"
"international political economic 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 political economy series") OR ("international politics economy series"))) OR ((("international political economic studies") OR ("international political economics series"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"international political economy series\") OR (\"international politics economy series\"))) or (((\"international political economic studies\") or (\"international political economics series\"))))~".
• Removing quotes may allow a broader search: (((( international political economy series ) OR ( international politics economy series ))) or ((( international political economic studies ) or ( international political economics series ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("international political economy series") OR ("international politics economy series"))) or ((("international political economic studies") or ("international political economics series"))))*.