Perhaps you should try some spelling variations:
doanh giai » doanh giao, doanh ngoai, doanh tai
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
ta doanh » va doanh, te doanh, ty doanh
giai cua » gian cua, gia cua, giai ca
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
cac toc » cac toi, cac nuoc, cac thoi
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 tu ((lang van) OR (dang van)) hoi. lieu va cac toc ta doanh giai cua te~.
• Adding a wildcard symbol may retrieve word variants: te sach tu ((lang van) or (dang van)) hoi. lieu va cac toc ta doanh giai cua te*.