Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
ban hanh » ban hang
va hanh » van hanh, va thanh, va danh
hieu le » hieu ve, hieu he, hieu ly
tay thu » tay tu
di cua » dai cua, doi cua, de cua
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
le tay » le tai, le ta, le tan

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: vu sac ky nang ((ma hoi) OR (ma hoa)). hieu le tay thu ((va hanh) OR (ban hanh)) di cua viet~.
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang ((ma hoi) or (ma hoa)). hieu le tay thu ((va hanh) or (ban hanh)) di cua viet*.