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 surveys", "international political economic studies"
"international prices economic series" » "international best economic series", "international banks economic series", "international crisis economic series", "international brief economic series", "international africa's economic series", "international prices economic theories", "international prices economic surveys", "international prices economic studies"

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