Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
ban hang » ngan hang
sach ty » sach tu, sach thu, xach tay
dao duc » giao duc, tao duoc
cua tre » cua te, cuu tre, cua triet
xang x » nang x
x hoi » xa hoi, o hoi, x ho

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) OR (sach y)) xang x hoi. hieu van dao duc ((va thanh) or (ban hang)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) xang x hoi. hieu van dao duc ((va thanh) OR (ban hang)) dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) xang x hoi. hieu van dao duc ((va thanh) or (ban hang)) dai cua tre*".