Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
cam tuc » cam tu, nam thuc, dam thuc
cua tre » cua te, cuu tre, cua triet
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: toc sach ty xang xa hoi. hieu va ((cam tuc) OR (cam xuc)) van hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ty xang xa hoi. hieu va ((cam tuc) or (cam xuc)) van hanh vi cua tre*.