Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
van xuat » san xuat, phan xuat, van chat
va doanh » van doanh, vay doanh, va danh
lang van » dang van, tang van, hoang van
va xuat » va luat, san xuat, hoa xuat
dan cua » dan ca, ban cua, dai cua
duoc va » nuoc va, duc va, duoc ma
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet

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 ky ((lang xa) OR (lang van)) hoi. hieu ((van xuat) OR (va xuat)) duoc va doanh dan cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (lang van)) hoi. hieu ((van xuat) OR (va xuat)) duoc va doanh dan cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (lang van)) hoi. hieu ((van xuat) OR (va xuat)) duoc va doanh dan cua tre*.