Perhaps you should try some spelling variations:
"international poverty economic surveys" » "national poverty economic surveys", "international property economic surveys", "international forestry economic surveys", "international policy economic surveys", "international poverty economic studies", "international poverty economic systems"
"international best economy series" » "international bank economy series", "international business economy series", "international best economics series", "international host economy series", "international next economy series", "international net economy series"

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

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