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