Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, ban hanh, dao hanh
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu he » hieu ve, hiem he, hieu le
va danh » va dinh, va dan, dia danh
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
he nam » ha nam, nghe nam
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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