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 policy autonomy series", "international poppy economy series"
"international political ecological services" » "international political economic services", "international political economics services", "international social ecological services", "international political hydrological services", "international political clinical services", "international political meteorological services"

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