Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
day danh » day manh, dai danh, dao danh
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
danh di » danh du, xanh di, danh dien
va viet » hoa viet, san viet, mai viet
co viet » so viet, o viet, hoc viet
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang mai hoi. hieu ve nam thuc day danh di ((va viet) or (co viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang mai hoi. hieu ve nam thuc day danh di ((va viet) OR (co viet)).
• Adding a wildcard symbol may retrieve word variants: so sach ky nang mai hoi. hieu ve nam thuc day danh di ((va viet) or (co viet))*.