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 business economy series" » "international business entry series", "international business economics 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 business economy series") or ("international poverty economic surveys"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international business economy series") OR ("international poverty economic surveys")).
• Removing quotes may allow a broader search: (( international business economy series ) or ( international poverty economic surveys )).
• Adding a wildcard symbol may retrieve word variants: (("international business economy series") or ("international poverty economic surveys"))*.