Perhaps you should try some spelling variations:
"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", "international policy economics series"
"international political economic systems" » "international political economy systems", "international policy economic systems", "international ecological economics systems", "international political economic sectors", "international political economic status"

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