Perhaps you should try some spelling variations:
doanh dao » doanh bao, doanh cao, doanh giao
va doanh » van doanh, vay doanh, va danh
te sach » toc sach
dao cua » dai cua, day cua, dan cua
cac toc » cac toi, cac nuoc, cac thoi
sach ky » sac ky, sach y, sach ty
cau toc » cao toc, cau hoc, cau truc
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cua te » cua tu

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 ((nang xa) OR (nang ma)) hoi. lieu va ((cau toc) OR (cac toc)) va doanh dao cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) OR (nang ma)) hoi. lieu va ((cau toc) or (cac toc)) va doanh dao cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) OR (nang ma)) hoi. lieu va ((cau toc) or (cac toc)) va doanh dao cua te*.