Perhaps you should try some spelling variations:
ban hanh » ban hang
cham tuc » nham thuc, pham thuc, tham thuc
su sach » so sach
vu sach » vu bach, vu khach
tuc ban » thuc ban, truc ban, tu ban
mai hoi » mai khoi, dai hoi, mai doi
va cham » va chat, va tham
hieu va » lieu va, hieu qua
lai hoi » dai hoi, lai hoa, lai roi
vi hoa » voi hoa, vi hoc, va hoa
v tang » 6 tang, 7 tang, 5 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) v tang ((mai hoi) or (lai hoi)). hieu va cham tuc ban hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) v tang ((mai hoi) OR (lai hoi)). hieu va cham tuc ban hanh vi hoa viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) v tang ((mai hoi) or (lai hoi)). hieu va cham tuc ban hanh vi hoa viet*".