Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
ca viet » va viet, co viet, hoa viet
va hanh » van hanh, va thanh, ban hanh
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu le » hieu ve, hieu he, hieu ly
va danh » va dinh, va dan, dia danh
doi ca » doi cua, doi cay, duoi ca
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na

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

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