Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
va triet » va thiet, va trien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
sach ly » sach y, sach lo, sach ty
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
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 ly nang ma hoi. hieu ve nam thuc va danh vi ((va triet) or (va thieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly nang ma hoi. hieu ve nam thuc va danh vi ((va triet) OR (va thieu)).
• Adding a wildcard symbol may retrieve word variants: so sach ly nang ma hoi. hieu ve nam thuc va danh vi ((va triet) or (va thieu))*.