Perhaps you should try some spelling variations:
"international policy economic series" » "international poverty economic series", "international prices economic series", "national policy economic series", "international policy economics series", "international policy economic services", "international policy economy series"
"international political economic series" » "international political economy series", "international ecological economics series", "international political economics series", "international political economic 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 policy economic series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economic series") OR ("international policy economic series")).
• Removing quotes may allow a broader search: (( international political economic series ) or ( international policy economic series )).
• Adding a wildcard symbol may retrieve word variants: (("international political economic series") or ("international policy economic series"))*.