Perhaps you should try some spelling variations:
treatment challenges » greatest challenges, present challenges, recent challenges
challenges funing » challenges finding, challenges facing, challenges during
3.1 treatment » 3 treatment, gas treatment, 4 treatment
funing zhong » funding among
zhong zhi » zhang zhi, hong ghi, zhong tai
wan yan » wang yan, nan yan, wai yan
yang xi » yang di, yang yi, yang jui
a 3.1 » _ 3.1, a 3.2, a 3.3
ng a » lng a, ngo a, png a

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 a 3.1 treatment challenges funing zhong zhi ;~.
• Adding a wildcard symbol may retrieve word variants: ((wan yan) or (yang xi))ng a 3.1 treatment challenges funing zhong zhi ;*.