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