Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
tu sach » thu sach, su sach, te sach
qua cam » qua cham, qua cac, qua ca
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, ma hoa, me hoi
vai va » mai va, dai va, hai va

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 ((ma hoi) or (xa hoi)). hieu ((qua cam) or (va cham)) xuc van hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ((ma hoi) OR (xa hoi)). hieu ((qua cam) OR (va cham)) xuc van hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ((ma hoi) or (xa hoi)). hieu ((qua cam) or (va cham)) xuc van hanh vai va triet*.