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 studies", "international political economic surveys"
"international poverty economics series" » "national poverty economics series", "international poverty economic series", "international poverty economies series", "international property economic series"

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