Perhaps you should try some spelling variations:
"international brief economic studies" » "international series economic studies", "international relief economic studies", "international border economic studies", "international tariff economic studies", "international britain economic studies", "international british economic studies"
"international river economic status" » "international rice economic status", "international poverty economic status", "international reserve economic status", "international river economic sectors", "international river socioeconomic status", "international driven economic status", "international drives economic status", "international wider economic 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 river economic status"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international brief economic studies") OR ("international river economic status")).
• Removing quotes may allow a broader search: (( international brief economic studies ) or ( international river economic status )).
• Adding a wildcard symbol may retrieve word variants: (("international brief economic studies") or ("international river economic status"))*.