Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
va danh » va dinh, va dan, dia danh
va hanh » va thanh, ban hanh, dao hanh
doi cua » dai cua, hoi cua
dang ma » dang mau, dang mam, dang mat
hieu le » hieu ve, hieu he, hieu ly
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na
ma hoi » mai hoi, xa hoi, ma hoa
su sac » su sach, su cac, su xac

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