Perhaps you should try some spelling variations:
doanh cau » doanh chau, danh cau, doanh cao
dang xay » dang van, van xay
ta doanh » va doanh, te doanh, ty doanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
cau cua » cau qua, ca cua, cu cua
toc ta » toc tay, toc thai
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 ky ((lang xa) OR (dang xay)) hoi. hieu va cac toc ta doanh cau cua te~.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (dang xay)) hoi. hieu va cac toc ta doanh cau cua te*.