Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu cac » hieu luc, hieu va, hieu van
hanh dan » thanh dan, hanh san, canh dan
hieu cao » chieu cao, hieu ca, kieu cao
soc van » hoc van, oc van, soc dan
sac van » cac van, san van, sat van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
san ky » sang ky, van ky, dan ky
dan su » dang su
tu san » thu san, tu ban, 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: tu san ky lang xa hoi. ((hieu cao) OR (hieu cac)) chat ((soc van) OR (sac van)) hanh dan su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky lang xa hoi. ((hieu cao) OR (hieu cac)) chat ((soc van) or (sac van)) hanh dan su triet~".
• Adding a wildcard symbol may retrieve word variants: tu san ky lang xa hoi. ((hieu cao) OR (hieu cac)) chat ((soc van) or (sac van)) hanh dan su triet*.