Perhaps you should try some spelling variations:
"international ecological economics survey" » "international economics economics survey", "international economic economics survey", "international political economics survey", "international ecological economic survey", "international ecological economic surveys", "international ecological economics studies"
"international energy economic services" » "international best economic services", "international energy ecological services", "international energy economic surveys", "international energy economic studies", "international energy economics services", "international energy economy services"

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