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 surveys" » "international political economy surveys", "international ecological economics surveys", "international political economic studies", "international political economic systems"

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