Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
lang van » dang van, tang van, hoang van
te sach » toc sach
dan cua » dan ca, ban cua, dai cua
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
toc va » hoc va, tuc va, loc va
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 ty ((dang xay) OR (lang van)) hoi. hieu van cac ((toc va) OR (toc ta)) doanh dan cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((dang xay) or (lang van)) hoi. hieu van cac ((toc va) OR (toc ta)) doanh dan cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((dang xay) or (lang van)) hoi. hieu van cac ((toc va) OR (toc ta)) doanh dan cua te*.