Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cac toi » cac thoi
dao cua » dai cua, day cua, dan cua
van cac » van hac, van cau, van bac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va dan » ca dan, va dao, va dau
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 lang xa hoi. hieu van cac toi ((va doanh) OR (va dan)) dao cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky lang xa hoi. hieu van cac toi ((va doanh) or (va dan)) dao cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky lang xa hoi. hieu van cac toi ((va doanh) or (va dan)) dao cua te*.