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 services" » "international policy economic services", "international political economy services", "international political ecological services", "international political economic studies", "international political economic surveys"

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

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