Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
ban hanh » ban hang
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, mai doi
lai hoi » dai hoi, lai hoa, lai roi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tuc ban » thuc ban, truc ban, tu ban
sach 6 » sach y, sach 2
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: su sach 6 tang ((mai hoi) or (lai hoi)). hieu va cham tuc ban hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 6 tang ((mai hoi) OR (lai hoi)). hieu va cham tuc ban hanh vi cua vat*.