Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh doanh
doanh dao » doanh bao, doanh cao, doanh giao
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac toc » cac toi, cac thoi
te sac » te sach, te cac, te san
cua te » cua tu
sac ky » cac ky, sai ky

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 hoi. hieu van ((cac toc) OR (cac nuoc)) va ((doanh dan) or (doanh dao)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. hieu van ((cac toc) OR (cac nuoc)) va ((doanh dan) OR (doanh dao)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. hieu van ((cac toc) OR (cac nuoc)) va ((doanh dan) or (doanh dao)) cua te*".