Perhaps you should try some spelling variations:
international ecological » international economics, international economic, international economies
international political » international policy
"International political economic series" » "International political economy series", "International policy economic series", "International political economic services", "International political economic theories", "International political economic surveys"
"International ecological economics series" » "International ecological economic studies"

You may be able to get more results by adjusting your search query.

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