Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
van nhan » van phan, van thanh, danh nhan
va nhan » ca nhan, va phan, va nha
sach ty » sach y, sach tu, sach thu
luc ban » duc ban, cuc ban, luc bat
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ma hoi. lieu ((va nhan) or (van nhan)) luc ban hanh vi ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. lieu ((va nhan) OR (van nhan)) luc ban hanh vi ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. lieu ((va nhan) or (van nhan)) luc ban hanh vi ((va triet) or (su triet))*.