Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
so sach » so sanh, bo sach, co sach
mang xa » lang xa, mang may, dang xay
hieu ly » hieu ky, lieu ly, dieu ly
van anh » van thanh, tuan anh, van minh
anh hoi » anh noi, anh hoc, anh khoa
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2

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 v ((mang xa) or (nang x)) hoi. hieu ly nam thuc van anh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v ((mang xa) OR (nang x)) hoi. hieu ly nam thuc van anh hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach v ((mang xa) or (nang x)) hoi. hieu ly nam thuc van anh hoi cua tre*.