Perhaps you should try some spelling variations:
greatest challenges » greatest challenge, treatment challenges, related challenges
challenges funding » challenges finding, challenge finding, challenges branding
funding among » bonding among, building among, jumping among
among ghi » among di, among hiv, among hr
wan yan » wang yan, nan yan, wai yan
yang xi » yang di, yang yi, yang jui
ya 3 » 2a 3, 4a 3, 5a 3

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((wan yan) OR (yang xi))ng ((ya 3) OR (a 3)) greatest challenges funding among ghi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wan yan) or (yang xi))ng ((ya 3) OR (a 3)) greatest challenges funding among ghi ;~".
• Adding a wildcard symbol may retrieve word variants: ((wan yan) or (yang xi))ng ((ya 3) OR (a 3)) greatest challenges funding among ghi ;*.