Perhaps you should try some spelling variations:
"international ecological economics series" » "international technological economics series", "international psychological economics series", "international economics economics series"
"international political economic studies" » "international policy economic studies", "international political economy studies", "international political economic status"

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 series") OR ("international political economic studies"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international ecological economics series\") OR (\"international political economic studies\"))".
• Removing quotes may allow a broader search: (( international ecological economics series ) OR ( international political economic studies )).
• Adding a wildcard symbol may retrieve word variants: (("international ecological economics series") OR ("international political economic studies"))*.