Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
duc ban » duc tan, duc van, dua ban
thu san » thuy san, thu ban, phu san
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
luc ban » cuc ban, luc bat, luc van
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa

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: thu san ky nang ma hoi. hieu va nhan ((luc ban) OR (duc ban)) hanh vi ((va triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ky nang ma hoi. hieu va nhan ((luc ban) OR (duc ban)) hanh vi ((va triet) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: thu san ky nang ma hoi. hieu va nhan ((luc ban) OR (duc ban)) hanh vi ((va triet) or (su triet))*.