Perhaps you should try some spelling variations:
sang tao » hang tai
va triet » va thiet, va trien, ve triet
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
luc ban » cuc ban, luc bat, luc van
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang

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 ky sang tao hoi. hieu va tham ((luc ban) or (duc ban)) hanh tai ((va triet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang tao hoi. hieu va tham ((luc ban) OR (duc ban)) hanh tai ((va triet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang tao hoi. hieu va tham ((luc ban) or (duc ban)) hanh tai ((va triet) or (hoa viet))*.