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 economics series", "international political economic services"
"international social ecological services" » "international society ecological services", "international sourcing ecological services", "international seminar ecological services", "international social hydrological services", "international social clinical services", "international social 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 economic series") or ("international social ecological services"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economic series") OR ("international social ecological services"))*.
• Removing quotes may allow a broader search: (( international political economic series ) or ( international social ecological services ))*.