Perhaps you should try some spelling variations:
ban hanh » ban hang
te sach » toc sach
va tinh » may tinh
dao duc » giao duc, tao duoc
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
tang xa » trang xa, lang xa, tang ha
di cua » dai cua, doi cua, de cua
ve dao » de dao, va dao, ve bao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((tang xa) OR (tang ma)) hoi. hieu ve dao duc ((ban hanh) or (va tinh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((tang xa) OR (tang ma)) hoi. hieu ve dao duc ((ban hanh) OR (va tinh)) di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((tang xa) OR (tang ma)) hoi. hieu ve dao duc ((ban hanh) or (va tinh)) di cua tre*".