Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac vung » cac ung, cac chung, cach dung
sach ky » sac ky, sach y, sach ty
van anh » van thanh, tuan anh, van minh
cac vuc » cac nuoc, cac cuoc, cac quoc
hieu ve » hieu va, hieu van
cho hoc » khoa hoc
cua cau » cua cac, cua chu, cua cay
anh vi » hanh vi, anh va, anh ve
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 ky nang ((cho hoc) OR (co hoc)). hieu ve ((cac vuc) OR (cac vung)) van anh vi cua cau~.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((cho hoc) or (co hoc)). hieu ve ((cac vuc) or (cac vung)) van anh vi cua cau*.