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

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 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 political economic series\") OR (\"International political economic studies\"))) or (\"international political economics series\"))))~".
• Removing quotes may allow a broader search: (( international political 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 political economy series") or ((((("International political economic series") OR ("International political economic studies"))) or ("international political economics series"))))*.