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