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