Perhaps you should try some spelling variations:
treatment challenges » greatest challenges, present challenges, recent challenges
challenges funing » challenges finding, challenges facing, challenges during
funing zhang » funing zhong, anming zhang
3 treatment » 4 treatment, 3.1 treatment, 5.3 treatment
zhang zhi » zhong zhi, wang zhi, zhang wei
nan yan » nan ya, wang yan, qian yan
yang xi » yang di, yang yi, yang jui
ya 3 » a 3, 2a 3, 4a 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: ((nan yan) OR (yang xi))ng ya 3 treatment challenges funing zhang zhi ;~.
• Adding a wildcard symbol may retrieve word variants: ((nan yan) or (yang xi))ng ya 3 treatment challenges funing zhang zhi ;*.