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 services", "international political economic theories", "international political economic surveys"
"international political ecological services" » "international policy ecological services", "international political economics services", "international social ecological services", "international political economies services", "international political hydrological services", "international political clinical services", "international political meteorological services"

Try widening your search to All Fields.

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