Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
sach tin » sach tien, sach kinh, sach tren
danh vai » danh sai, danh va, dang van
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
mang xa » lang xa, dang xay, mang cua
ve cam » ve cham, ve cac, va cam

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: thu sach tin ((mang xa) OR (mang may)) hoi. hieu ve cam duc va ((danh vai) OR (doanh van)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tin ((mang xa) OR (mang may)) hoi. hieu ve cam duc va ((danh vai) or (doanh van)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach tin ((mang xa) OR (mang may)) hoi. hieu ve cam duc va ((danh vai) or (doanh van)) cua tre*.