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

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