Perhaps you should try some spelling variations:
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, ve triet, cua triet
va trien » va truyen, va thiet, va tuyen
nang ma » tang ma, sang ma, nang cao
va chat » va phat, cao chat, hoa chat
soc van » hoc van, oc van, sac 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 ma hoa. lieu ((va chat) or (van chat)) soc van hanh vi ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ma hoa. lieu ((va chat) OR (van chat)) soc van hanh vi ((va triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ma hoa. lieu ((va chat) or (van chat)) soc van hanh vi ((va triet) or (va trien))*.