Perhaps you should try some spelling variations:
"international poverty economy series" » "national poverty economy series", "international poverty economic series", "international poverty economies series", "international property economic series", "international poverty economics series"
"international energy economic survey" » "international energy economics survey", "international energy economy survey", "international ecology economic survey", "international energy economic surveys", "international energy economic security", "international energy economic studies"

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