Perhaps you should try some spelling variations:
"international poverty economic studies" » "national poverty economic studies", "international property economic studies", "international forestry economic studies", "international policy economic studies", "international poverty economic status"
"international border economic survey" » "international borders economic survey", "international order economic survey", "international bidders economic survey", "international broader economic survey", "international worker economic survey", "international bolster economic survey", "international border economic surveys", "international border economic security", "international border economic success"

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 studies") or ("international border economic survey"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international poverty economic studies") OR ("international border economic survey"))*.
• Removing quotes may allow a broader search: (( international poverty economic studies ) or ( international border economic survey ))*.