Perhaps you should try some spelling variations:
doan vi » doan va, don vi, doan thi
sach va » sach xa, sach ha, sach dao
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
cuu va » cuu van
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 va) OR (sach y)) nang x hoi. hieu ve cham ((cuu va) OR (cuu ve)) doan vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach va) or (sach y)) nang x hoi. hieu ve cham ((cuu va) OR (cuu ve)) doan vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach va) or (sach y)) nang x hoi. hieu ve cham ((cuu va) OR (cuu ve)) doan vi cua tre*.