Perhaps you should try some spelling variations:
"international political economy theories" » "international policy economy theories", "international political economic theories", "international political economics theories", "international political economy series"
"national poverty economic services" » "national poverty economics series", "national poverty ecological services", "national poverty economic studies", "national property economic services", "national forestry economic services", "national policy economic services"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("national poverty economic services") or ("international political economy theories"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("national poverty economic services") OR ("international political economy theories"))*.
• Removing quotes may allow a broader search: (( national poverty economic services ) or ( international political economy theories ))*.