Perhaps you should try some spelling variations:
"international ecological economic studies" » "international technological economic studies", "international psychological economic studies", "international economics economic studies", "international ecological economics studies", "international ecology economic studies", "international ecological economic status"
"international political economic theories" » "international policy economic theories", "international political economy theories", "international ecological economics 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 ecological economic studies") OR ("international political economic theories"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international ecological economic studies\") OR (\"international political economic theories\"))".
• Removing quotes may allow a broader search: (( international ecological economic studies ) OR ( international political economic theories )).
• Adding a wildcard symbol may retrieve word variants: (("international ecological economic studies") OR ("international political economic theories"))*.