Perhaps you should try some spelling variations:
"international ecological economics theories" » "international technological economics theories", "international psychological economics theories", "international economics economics theories", "international ecological economic theories", "international ecological economics series", "international ecological economics theory"
"international policy economic series" » "international poverty economic series", "international prices economic series", "national policy economic series", "international policy economics series", "international policy economic services", "international policy economy 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 ecological economics theories") or ("international policy economic series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international ecological economics theories") OR ("international policy economic series"))*.
• Removing quotes may allow a broader search: (( international ecological economics theories ) or ( international policy economic series ))*.