Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hanh » ban hang
su sach » so sach, vu sach
soc ban » hoc ban, coc ban, so ban
va cham » va chat, va tham
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, mang may, dang xay
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thuoc sach)) ty ((mang xa) or (nang x)) hoi. hieu va cham soc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ty ((mang xa) OR (nang x)) hoi. hieu va cham soc ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ty ((mang xa) or (nang x)) hoi. hieu va cham soc ban hanh vi cua tre*.