Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dang mat » dang vat, dang mau, dung mat
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua
hieu le » hieu ve, hieu he, hieu ly
mat hoi » mai hoi, sat hoi, mat troi
ky dang » ky nang, ky danh
sai ky » sac ky
le nam » ly nam, he nam, le na
su sai » su tai, su hai, su dai

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 dang mat hoi. hieu le nam thuc ((((ban hanh) or (van hanh))) or (va danh)) doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky dang mat hoi. hieu le nam thuc ((((ban hanh) OR (van hanh))) OR (va danh)) doi cua vat.
• Adding a wildcard symbol may retrieve word variants: su sai ky dang mat hoi. hieu le nam thuc ((((ban hanh) or (van hanh))) or (va danh)) doi cua vat*.