Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
cac toi » cac thoi
lang xa » lang ha, lang van
dan cua » dan ca, ban cua, dai cua
cac toc » cac nuoc, cac thoi
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
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 sac ky ((lang xa) OR (dang xay)) hoi. hieu van ((cac toc) or (cac toi)) va doanh dan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((lang xa) OR (dang xay)) hoi. hieu van ((cac toc) OR (cac toi)) va doanh dan cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((lang xa) OR (dang xay)) hoi. hieu van ((cac toc) or (cac toi)) va doanh dan cua te*".