Perhaps you should try some spelling variations:
"international political economic theories" » "international policy economic theories", "international ecological economics theories", "international political economic theory", "international political economics series"
"international political economy services" » "international policy economy services", "international political economic services", "international political economy series", "international political recovery services"

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