Perhaps you should try some spelling variations:
"international ecological economic studies" » "international economics economic studies", "international economic economic studies", "international political economic studies", "international ecological economics studies", "international ecological economic status", "international ecological economic surveys"
"international africa's economic theories" » "international prices economic theories", "international agencies economic theories", "international price economic theories", "international africa economic theories", "international african economic theories", "international china's economic theories", "international africa's economic theory"

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