Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
nam thuc » nam thuoc, am thuc, nam thu
hieu he » hieu ve, hiem he, hieu hien
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu le » hieu ve, hieu ly, tieu le
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
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 mai hoi. ((hieu le) OR (hieu he)) nam thuc ((va hanh) or (va danh)) di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang mai hoi. ((hieu le) OR (hieu he)) nam thuc ((va hanh) OR (va danh)) di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang mai hoi. ((hieu le) OR (hieu he)) nam thuc ((va hanh) or (va danh)) di cua vat".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang mai hoi. ((hieu le) OR (hieu he)) nam thuc ((va hanh) or (va danh)) di cua vat*.