Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
toc sach » hoc sach, doc sach, thuoc 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, co sach, hoc sach
nang ma » tang ma, sang ma, nang cao
bo sach » co sach, hoc sach
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 (bo sach))) OR (toc sach)) ky nang ma hoa. hieu van nham thuc va hanh vai cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((((so sach) or (bo sach))) or (toc sach)) ky nang ma hoa. hieu van nham thuc va hanh vai cua tre*.