Perhaps you should try some spelling variations:
greatest challenges » greatest challenge, treatment challenges, related challenges
challenges funing » challenges finding, challenges facing, challenges during
funing zhong » funding among
zhong zhi » zhang zhi, hong ghi, zhong tai
yang xi » yang di, yang yi, yang jui
ya 3 » a 3, 2a 3, 5a 3
4a 3 » a 3, 4 3, 44 3
wang » wing, wan, lang

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: ((wang yan) OR (yang xi))ng ((ya 3) OR (4a 3)) greatest challenges funing zhong zhi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yan) or (yang xi))ng ((ya 3) OR (4a 3)) greatest challenges funing zhong zhi ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang yan) or (yang xi))ng ((ya 3) OR (4a 3)) greatest challenges funing zhong zhi ;*.