Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
hanh dan » thanh dan, hanh san, canh dan
su triet » su tien, ve triet
nang xa » nang x, lang xa, nang ma
soc van » hoc van, oc van, soc dan
sac van » cac van, san van, sat van
su viet » so viet
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 cao 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 cao chat ((soc van) OR (sac van)) hanh dan ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang xa hoi. hieu cao 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 cao chat ((soc van) or (sac van)) hanh dan ((su triet) OR (su viet))*.