Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ca viet » va viet, co viet, hoa viet
ky tang » ky nang, ky dang, kho tang
va danh » va dinh, va dan, dia danh
hieu le » hieu ve, hieu he, hieu ly
va hanh » van hanh, va thanh, ban hanh
su sai » su tai, su hai, su dai
sai ky » sac ky
ma hoi » mai hoi, ma hoa, me hoi
le nam » ly nam, he nam, le na
di ca » di cau, di cua, doi ca

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky tang ((ma hoi) or (xa hoi)). hieu le nam thuc ((va hanh) or (va danh)) di ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky tang ((ma hoi) OR (xa hoi)). hieu le nam thuc ((va hanh) OR (va danh)) di ca viet.
• Adding a wildcard symbol may retrieve word variants: su sai ky tang ((ma hoi) or (xa hoi)). hieu le nam thuc ((va hanh) or (va danh)) di ca viet*.