Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va cham » va chat, va tham
soc van » hoc van, sac van, soc dan
hanh di » hanh vi, hanh de, hang di
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
oc van » hoc van, luoc van, quoc van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky lang xa hoi. lieu va cham ((soc van) OR (oc van)) hanh di ((su triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky lang xa hoi. lieu va cham ((soc van) OR (oc van)) hanh di ((su triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky lang xa hoi. lieu va cham ((soc van) OR (oc van)) hanh di ((su triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu san ky lang xa hoi. lieu va cham ((soc van) OR (oc van)) hanh di ((su triet) or (va triet))*.