Perhaps you should try some spelling variations:
cac doanh » cac dan, cac dang, van doanh
can nhanh » cach nhanh, nhan nhanh, chi nhanh
chong khi » khong khi, chong hiv, chong lai
doanh va » doan va, doanh tai, doanh cua
cong khi » cong thai, khong khi, co khi
eu cac » tu cac, su cac, vu cac
va khi » va chi, va kha, va ki
su can » su van, su cao, tu can

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: (( eu cac doanh va khi đong luc ) OR ( su can nhanh ((chong khi) OR (cong khi)) đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( eu cac doanh va khi đong luc ) or ( su can nhanh ((chong khi) or (cong khi)) đong luc ))*.