Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
xang xa » lang xa, ang xa, dang xay
mang xa » lang xa, mang may, dang xay
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va dau » va dao
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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: tu sach y ((xang xa) OR (mang xa)) hoi. hieu ve pham duc va dau ((di cua) OR (de cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((xang xa) OR (mang xa)) hoi. hieu ve pham duc va dau ((di cua) or (de cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((xang xa) OR (mang xa)) hoi. hieu ve pham duc va dau ((di cua) or (de cua)) triet*.