Perhaps you should try some spelling variations:
"international poverty economic surveys" » "national poverty economic surveys", "international best economic surveys", "international policy economic surveys", "international energy economic surveys"
"international price economy series" » "international prices economy series", "international policy economy series", "international aid economy series", "international rich economy series", "international service economy series", "international private economy series"

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