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

Try widening your search to All Fields.

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