Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
te sach » toc sach
dan cua » dan ca, ban cua, dai cua
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
lang xa » lang ha, dang xay
toc va » hoc va, toc ta, loc va
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) or (lang van)) hoi. hieu van cac ((toc va) OR (tuc va)) doanh dan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (lang van)) hoi. hieu van cac ((toc va) OR (tuc va)) doanh dan cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (lang van)) hoi. hieu van cac ((toc va) OR (tuc va)) doanh dan cua te*".