Perhaps you should try some spelling variations:
"international politics economy series" » "international political economy series", "international policy economy series", "international economics economy series", "international politics economics series", "international political economic series"
"international border economic studies" » "international borders economic studies", "international order economic studies", "international bidders economic studies", "international border economic status", "international broader economic studies", "international worker economic studies", "international bolster economic studies"

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

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