Perhaps you should try some spelling variations:
"international policy economic series" » "international poverty economic series", "national policy economic series", "international policy economic services", "international policy economy series", "international policy economic theories"
"international prices economics series" » "international prices economic series", "international crisis economics series", "international risks economics series"

You may be able to get more results by adjusting your search query.

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