Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sang dai » sang tai, lang dai, sang mai
va thanh » gia thanh, va tinh, le thanh
sach ty » sach tu, sach thu, xach tay
dai hoi » dai hoc, dai hai, dai moi
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va dao

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