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