Perhaps you should try some spelling variations:
"international political economy series" » "international policy economy series", "international political economics series"
"international prices economic services" » "international prices economics series", "international prices ecological services", "international prices economic studies", "international crises economic services", "international prices econometric services", "international services 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: (("international political economy series") or ("international prices economic services"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economy series") OR ("international prices economic services")).
• Removing quotes may allow a broader search: (( international political economy series ) or ( international prices economic services )).
• Adding a wildcard symbol may retrieve word variants: (("international political economy series") or ("international prices economic services"))*.