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