Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh dao » lanh dao, thanh dat, thanh dam
cac van » cac dan
soc van » hoc van, oc van, sac van
va chat » van chat, va phat, cao chat
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
san ky » sang ky, van ky, dan ky
dao va » dao van, tao va, do va
tu san » thu san, tu ban, tu can

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) OR (nang x)) hoi. hieu va chat ((soc van) or (cac van)) hanh dao va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((nang xa) OR (nang x)) hoi. hieu va chat ((soc van) OR (cac van)) hanh dao va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((nang xa) OR (nang x)) hoi. hieu va chat ((soc van) or (cac van)) hanh dao va triet".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang xa) OR (nang x)) hoi. hieu va chat ((soc van) or (cac van)) hanh dao va triet*.