Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
tang mai » tang ma, tang tai, sang mai
lang mai » lang dai, lang hai, lang man
doi cua » dai cua, hoi cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu le » hieu ve, hieu he, hieu ly
le nam » ly nam, he nam, le na
sac ky » cac ky, sai ky
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 ((tang mai) or (lang mai)) hoi. hieu le nam thuc ((va hanh) or (va danh)) doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((tang mai) OR (lang mai)) hoi. hieu le nam thuc ((va hanh) OR (va danh)) doi cua vat.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((tang mai) or (lang mai)) hoi. hieu le nam thuc ((va hanh) or (va danh)) doi cua vat*.