Perhaps you should try some spelling variations:
"international poverty economic surveys" » "national poverty economic surveys", "international property economic surveys", "international forestry economic surveys", "international energy economic surveys", "international poverty economic studies", "international poverty economic systems"
"international policy economic series" » "international prices economic series", "national policy economic series", "international policy economics series", "international policy economic services", "international policy 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 policy economic series") or ("international poverty economic surveys"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international policy economic series") OR ("international poverty economic surveys")).
• Removing quotes may allow a broader search: (( international policy economic series ) or ( international poverty economic surveys )).
• Adding a wildcard symbol may retrieve word variants: (("international policy economic series") or ("international poverty economic surveys"))*.