Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
toc sach » hoc sach, doc sach, thuoc sach
thu van » thuc van, thuy van, tu van
cac thu » cach thuc, cac thoi
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
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 hang xa hoi. hieu cua cac thu van ((anh vi) OR (anh ve)) cua te~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty hang xa hoi. hieu cua cac thu van ((anh vi) or (anh ve)) cua te*.