Perhaps you should try some spelling variations:
challenges funing » challenges finding, challenges facing, challenges during
5.3 treatment » 7.3 treatment, 3.1 treatment, gas treatment
funing zhong » funding among
3 treatment » 4 treatment, 3.1 treatment, 7.3 treatment
zhong zhi » zhang zhi, hong ghi, zhong tai
nan yan » nan ya, wang yan, qian yan
yang xi » yang di, yang yi, yang jui

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: ((nan yan) OR (yang xi))ng ya ((3 treatment) OR (5.3 treatment)) challenges funing zhong zhi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nan yan) or (yang xi))ng ya ((3 treatment) OR (5.3 treatment)) challenges funing zhong zhi ;~".
• Adding a wildcard symbol may retrieve word variants: ((nan yan) or (yang xi))ng ya ((3 treatment) OR (5.3 treatment)) challenges funing zhong zhi ;*.