Perhaps you should try some spelling variations:
"international brief economic studies" » "international relief economic studies", "international border economic studies", "international bridge economic studies", "international brief economic surveys", "international tariff economic studies", "international area economic studies", "international drive economic studies"
"international free economic status" » "international green economic status", "international fuel economic status", "international forest economic status", "international free economic sectors", "international free socioeconomic status", "international area economic status", "international free economy status"

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

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