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"

Try widening your search to All Fields.

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