Perhaps you should try some spelling variations:
"international political economic series" » "international policy economic series", "international ecological economics series", "international political economic services", "international political economic theories", "international political economic surveys"
"International political economy survey" » "International political economic survey", "International political economic surveys", "International political economy strategy"

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