Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
cac toc » cac toi, cac nuoc, cac thoi
sach ty » sach tu, sach thu, xach tay
van cac » van hac, van cau, van bac
lang ha » long ha
ha hoi » hoa hoi, ha noi, xa hoi
toc va » hoc va, toc ta, tuc va
cua te » cua tu
cua su » qua su

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) OR (sach y)) lang ha hoi. hieu van cac toc va doanh dan ((cua te) OR (cua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) lang ha hoi. hieu van cac toc va doanh dan ((cua te) or (cua su))~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach y)) lang ha hoi. hieu van cac toc va doanh dan ((cua te) or (cua su))*.