Perhaps you should try some spelling variations:
doanh cua » doanh luan
dieu hien » dieu khien, dieu kien, bieu hien
hien cac » thien cac, vien cac, hieu cac
danh ca » dan ca, danh cho, danh gia
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach tu, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
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: tu ((sach ty) OR (sach y)) nang x hoi. dieu hien cac xuc va ((danh ca) OR (doanh cua)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang x hoi. dieu hien cac xuc va ((danh ca) OR (doanh cua)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang x hoi. dieu hien cac xuc va ((danh ca) OR (doanh cua)) cua tre*.