Perhaps you should try some spelling variations:
"international politics economic studies" » "international relations economic studies", "international politics economics studies", "international politico economic studies", "international politics economy studies", "international politics economic success", "international politics economic survey"
"international political economic theories" » "international political economic theory", "international political economics series", "international political economics theory"
"international political economic studies" » "international political economic success", "international political economic survey"

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

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