Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach thue » sach thieu, sach tham, cach thuc
cua viet » ca viet, hoa viet, cua vat
sach thu » sach thieu, sach tham, cach thuc
thanh vi » hanh vi, thanh va, thanh ve
duc ban » duc tan, duc van, dua ban
cao duc » dao duc, cao suc, giao duc
va cao » va cac, va co, va dao
ma hoi » mai hoi, ma hoa, me hoi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) OR (sach thue)) nang ((ma hoi) or (xa hoi)). lieu va cao duc ban thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thue)) nang ((ma hoi) OR (xa hoi)). lieu va cao duc ban thanh vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach thue)) nang ((ma hoi) or (xa hoi)). lieu va cao duc ban thanh vi cua viet*".