Perhaps you should try some spelling variations:
"international political economy series" » "international policy economy series", "international political economic series"
"International political ecological services" » "International political economic services", "International political economics services", "International social ecological services", "International political hydrological services", "International political clinical services", "International political meteorological services"

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