Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
mai khoi » mai khoa, tai khoa, cac khoi
cua tre » cua te, cuu tre, cua triet
tuc ban » thuc ban, truc ban, tu ban
mai hoi » dai hoi, lai hoi, mai doi
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
vi cua » vai cua, di cua
tu cao » cu cao, tu cac, vu cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cao ky nang ((mai hoi) OR (mai khoi)). hieu ((ve cham) OR (va cham)) tuc ban thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cao ky nang ((mai hoi) or (mai khoi)). hieu ((ve cham) OR (va cham)) tuc ban thanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky nang ((mai hoi) or (mai khoi)). hieu ((ve cham) OR (va cham)) tuc ban thanh vi cua tre*.