Perhaps you should try some spelling variations:
can nhanh » cach nhanh, nhan nhanh, chi nhanh
cac doanh » cac dan, cac dang, van doanh
chong khi » khong khi, chong hiv, chong lai
doanh co » doanh cua, doanh va, anh co
cong khi » cong thai, khong khi, cong ha
eu cac » tu cac, su cac, vu cac
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 co khi đong luc ) OR ( su can nhanh ((chong khi) OR (cong khi)) đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( eu cac doanh co 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 co khi đong luc ) or ( su can nhanh ((chong khi) OR (cong khi)) đong luc ))*.