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