Perhaps you should try some spelling variations:
"international political economic theories" » "international politics economic theories", "international political economy theories", "international political economic theory", "international political economics series", "international political economic ties"
"international political economics theory" » "international politics economics theory", "international political economits theory", "international political economy theory", "international political economys theory", "international political economic theory", "international political economics history"
"international political economies series" » "international politics economies series", "international political economy series", "international politics economics series", "international political ideologies series", "international political economics series", "international political economic series"
"international relations economic studies" » "international relations conflict studies", "international innovations economic studies", "international relations economic success", "international relations 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 relations economic studies") OR ((("international political economic theories") OR ("international political economics theory"))))) OR ("international political economies series"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"international relations economic studies\") or (((\"international political economic theories\") OR (\"international political economics theory\"))))) or (\"international political economies series\"))~".
• Removing quotes may allow a broader search: (((( international relations economic studies ) or ((( international political economic theories ) OR ( international political economics theory ))))) or ( international political economies series ))~.
• Adding a wildcard symbol may retrieve word variants: (((("international relations economic studies") or ((("international political economic theories") OR ("international political economics theory"))))) or ("international political economies series"))*.