Perhaps you should try some spelling variations:
danh tranh » canh tranh, danh thanh, lanh tranh
cao nhanh » cao nhan, cach nhanh, khao nhanh
chong khi » khong khi, cong khi, chong lai
chong hiv » among hiv, chong li, chong vi
tac danh » sach danh, cac doanh, cac dan
tranh o » tranh co, trang o, trinh o
te cao » te bao
o khi » co khi, bo khi

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: (( tac danh tranh o khi đong luc ) OR ( te cao nhanh ((chong khi) OR (chong hiv)) đong luc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tac danh tranh o khi đong luc ) or ( te cao nhanh ((chong khi) OR (chong hiv)) đong luc ))~".
• Adding a wildcard symbol may retrieve word variants: (( tac danh tranh o khi đong luc ) or ( te cao nhanh ((chong khi) OR (chong hiv)) đong luc ))*.