Perhaps you should try some spelling variations:
"international poverty economic series" » "national poverty economic series", "international property economic series", "international forestry economic series", "international energy economic series", "international poverty economics series", "international poverty economic services", "international poverty economy series"
"international policy economic surveys" » "international prices economic surveys", "national policy economic surveys", "international policy economic studies", "international policy economic systems"

Try widening your search to All Fields.

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