Perhaps you should try some spelling variations:
"international political economy series" » "international policy economy series", "international political economics series"
"international prices economic surveys" » "international prices economic studies", "international prices economic systems", "international crises economic surveys", "international prices econometric surveys", "international services economic surveys"

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

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