Perhaps you should try some spelling variations:
ban thanh » ban hang
thai cua » than cua, tai cuc, tri cua
ban hanh » ban hang
hoang xa » hoang ha, hoang va, hoang xuan
te sach » toc sach
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
sach tu » sach thu, cach tu, sach ty
hang xa » hang va, hang ca, lang xa
cua tre » cua te, cuu tre, cua triet

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 tu ((hang xa) or (hoang xa)) hoi. hieu va giao duc ((ban thanh) or (ban hanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((hang xa) OR (hoang xa)) hoi. hieu va giao duc ((ban thanh) OR (ban hanh)) thai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu ((hang xa) or (hoang xa)) hoi. hieu va giao duc ((ban thanh) or (ban hanh)) thai cua tre*.