Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nguoi sach » nguoi san, nuoc sach
tay mang » cay mang, tao mang, tay lang
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
vi cua » vai cua, di cua

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: ((thuoc sach) OR (nguoi sach)) tay mang may hoi. hieu va cau truc va hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (nguoi sach)) tay mang may hoi. hieu va cau truc va hanh vi cua tre*.