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