Perhaps you should try some spelling variations:
"international ecological economics series" » "international technological economics series", "international psychological economics series", "international economics economics series"
"international political economic series" » "international policy economic series", "international political economy series", "international political economic services", "international political economic theories"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("international political economic series") or ("international ecological economics series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economic series") OR ("international ecological economics series"))*.
• Removing quotes may allow a broader search: (( international political economic series ) or ( international ecological economics series ))*.