Perhaps you should try some spelling variations:
"international political economy series" » "international policy economy series", "international political economic series"
"international poverty ecological services" » "national poverty ecological services", "international best ecological services", "international poverty hydrological services", "international poverty clinical services", "international poverty meteorological services", "international poverty economic 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 political economy series") or ("international poverty ecological services"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international political economy series") OR ("international poverty ecological services")).
• Removing quotes may allow a broader search: (( international political economy series ) or ( international poverty ecological services )).
• Adding a wildcard symbol may retrieve word variants: (("international political economy series") or ("international poverty ecological services"))*.