Perhaps you should try some spelling variations:
dang tao » sang tao, nang tao, vang tao
tao khoi » tao hoi, thao khoa, lao khoa
cua viet » ca viet, hoa viet, cua vat
ky dang » ky nang, ky danh
hieu le » hieu ve, hieu he, hieu ly
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
doi cua » dai cua, hoi cua
su sai » su tai, su hai, su dai
sai ky » sac ky
le am » le ham, le nam, le a

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: su sai ky dang tao khoi. hieu le am thuc ((va hanh) OR (va danh)) doi cua viet~.
• Adding a wildcard symbol may retrieve word variants: su sai ky dang tao khoi. hieu le am thuc ((va hanh) or (va danh)) doi cua viet*.