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

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