Perhaps you should try some spelling variations:
present challenges » current challenges, assessment challenges
challenges min » challenges m, challenges making, challenges moving
la present » la presente, a present, la presence
wang liang » wang yang
min zhong » min hong, tin hong, amin hong
zhong zhi » zhang zhi, hong ghi, zhong tai
yang yi » yang xi, yang jui
ong et » along et

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 liang) OR (((yang yi) OR (yang di))))ong et la present challenges min zhong zhi ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang liang) or (((yang yi) or (yang di))))ong et la present challenges min zhong zhi ;*.