Perhaps you should try some spelling variations:
"international poverty economic surveys" » "national poverty economic surveys", "international best economic surveys", "international policy economic surveys", "international energy economic surveys"
"international prices economic studies" » "international best economic studies", "international banks economic studies", "international prices economic status", "international crisis economic studies", "international brief economic studies", "international africa's economic studies"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("international poverty economic surveys") or ("international prices economic studies"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international poverty economic surveys") OR ("international prices economic studies"))*.
• Removing quotes may allow a broader search: (( international poverty economic surveys ) or ( international prices economic studies ))*.