Perhaps you should try some spelling variations:
doanh bac » doanh bat, doanh ban, danh bac
toc sach » hoc sach, doc sach, thuoc sach
nang van » dang van, tang van, lang van
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
van hoi » van hoa, van hoc, van hoe
van cac » van hac, van cau, van bac
cac toc » cac toi, cac nuoc, cac thoi
bac cua » ban cua, tac cua, bai cua
toc va » hoc va, toc ta, tuc va
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) OR (toc sach)) ky nang van hoi. hieu van cac toc va doanh bac cua te~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang van hoi. hieu van cac toc va doanh bac cua te*.