Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
giao cua » gian cua, gia cua, giau cua
hoc sach » hoc sinh, hoc cac, hoc anh
va daoh » va danh, va doanh
cac toc » cac toi, cac nuoc, cac thoi
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 dao » ca dao
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 (hoc sach)) ky lang xa hoi. hieu van cac toc ((va daoh) OR (va dao)) giao cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky lang xa hoi. hieu van cac toc ((va daoh) or (va dao)) giao cua te~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ky lang xa hoi. hieu van cac toc ((va daoh) or (va dao)) giao cua te*.