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