Perhaps you should try some spelling variations:
doanh giao » danh gia, anh giao, toan giao
toc sach » hoc sach, thuoc sach, nuoc sach
giao cua » gian cua, gia cua, giau cua
doc sach » hoc sach, nuoc sach, dac sac
va doanh » van doanh, vay doanh, va danh
lang van » dang van, tang van, hoang van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cac toc » cac toi, cac thoi
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
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: ((toc sach) OR (doc sach)) ky lang van hoi. hieu va ((cac toc) OR (cac nuoc)) va doanh giao cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ky lang van hoi. hieu va ((cac toc) or (cac nuoc)) va doanh giao cua te~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ky lang van hoi. hieu va ((cac toc) or (cac nuoc)) va doanh giao cua te*.