Perhaps you should try some spelling variations:
doanh dao » doanh bao, doanh cao, doanh giao
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac toc » cac nuoc, cac thoi
sach ky » sac ky, sach y, sach ty
cac toi » cac thoi
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 sach ky lang xa hoi. hieu van ((cac toc) OR (cac toi)) va doanh dao ((cua te) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu van ((cac toc) OR (cac toi)) va doanh dao ((cua te) or (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu van ((cac toc) OR (cac toi)) va doanh dao ((cua te) or (cua tu))*.