Perhaps you should try some spelling variations:
su triet » su tien, ve triet
hanh dan » thanh dan, hanh san, canh dan
su viet » so viet
nang xa » nang x, lang xa, nang ma
hieu ca » hieu cac, hieu cua, hieu va
ca chat » cao chat, cac chat, va chat
soc van » hoc van, oc van, soc dan
sac van » cac van, san van, sat van
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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 nang xa hoi. hieu ca chat ((soc van) or (sac van)) hanh dan ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang xa hoi. hieu ca chat ((soc van) OR (sac van)) hanh dan ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: tu san ky nang xa hoi. hieu ca chat ((soc van) or (sac van)) hanh dan ((su triet) or (su viet))*.