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

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