Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
van doanh » toan doanh, van dong, van thanh
hac toc » thac toc
cac toc » cac toi, cac nuoc, cac thoi
dan cua » dan ca, ban cua, dai cua
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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