Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh dan » thanh dan, hanh san, canh dan
hieu cao » chieu cao, hieu cac, kieu cao
sac van » cac van, san van, sat van
soc van » hoc van, oc van, soc dan
hieu ca » hieu cac, hieu cua, hieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
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 dang xa hoi. ((hieu cao) OR (hieu ca)) 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 dang xa hoi. ((hieu cao) OR (hieu ca)) chat ((soc van) or (sac van)) hanh dan su triet~".
• Adding a wildcard symbol may retrieve word variants: tu san ky dang xa hoi. ((hieu cao) OR (hieu ca)) chat ((soc van) or (sac van)) hanh dan su triet*.