Perhaps you should try some spelling variations:
ban thanh » ban hang
cua viet » ca viet, hoa viet, cua vat
ban hanh » ban hang
cam duc » cam xuc, cao duc, pham duc
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang

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: tu sach ((ly nang) OR (v nang)) ma hoi. hieu va cam duc ((ban thanh) OR (ban hanh)) vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) or (v nang)) ma hoi. hieu va cam duc ((ban thanh) OR (ban hanh)) vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (v nang)) ma hoi. hieu va cam duc ((ban thanh) OR (ban hanh)) vai cua viet*.