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