Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu cua » hieu qua, dieu cua, bieu cua
xang xa » lang xa, mang xa, ang xa
cac tu » cac thu, cach tu, cac du
tu van » tu va
anh vi » hanh vi, anh va, anh vu
anh ve » hanh ve, anh va, anh viet
cua te » cua tu

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: ((te sach) OR (toc sach)) ty xang xa hoi. hieu cua cac tu van ((anh vi) OR (anh ve)) cua te~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty xang xa hoi. hieu cua cac tu van ((anh vi) or (anh ve)) cua te*.