Perhaps you should try some spelling variations:
"international policy economic studies" » "international poverty economic studies", "international prices economic studies", "national policy economic studies", "international policy economic status", "international policy economic surveys"
"international crisis economic services" » "international credit economic services", "international civil economic services", "international risk economic services", "international crisis ecological services", "international crisis economic surveys", "international crisis economic survey", "international china's 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 policy economic studies") or ("international crisis economic services"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international policy economic studies") OR ("international crisis economic services")).
• Removing quotes may allow a broader search: (( international policy economic studies ) or ( international crisis economic services )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic studies") or ("international crisis economic services"))*.