Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
hieu van » hieu va, thien van, lieu va
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
toc sach » doc sach, thuoc sach, nuoc sach
van nham » van nam, van nhan, van tham
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((so sach) OR (hoc sach))) OR (toc sach)) ky sang ma hoa. hieu van nham thuc va hanh vai cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((((so sach) or (hoc sach))) or (toc sach)) ky sang ma hoa. hieu van nham thuc va hanh vai cua tre*.