Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
dao xuc » dao duc, dao tuc, dao xu
va vanh » va danh, va hanh, va anh
than va » thanh va, nhan va, toan va
san ky » sang ky, dan ky, ban ky
va dao » ca dao
x hoi » xa hoi, o hoi, x ho

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: thuat ((san ky) OR (van ky)) nang x hoi. hieu va dao xuc ((va vanh) OR (va van)) than va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((san ky) OR (van ky)) nang x hoi. hieu va dao xuc ((va vanh) or (va van)) than va triet~".
• Adding a wildcard symbol may retrieve word variants: thuat ((san ky) OR (van ky)) nang x hoi. hieu va dao xuc ((va vanh) or (va van)) than va triet*.