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