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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("international political economic series") or ("International ecological economics survey"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economic series") OR ("International ecological economics survey")).
• Removing quotes may allow a broader search: (( international political economic series ) or ( International ecological economics survey )).
• Adding a wildcard symbol may retrieve word variants: (("international political economic series") or ("International ecological economics survey"))*.