Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
thanh ve » hanh ve, thanh va, thanh vien
mai khoi » mai khoa, tai khoa, cac khoi
mai hoi » dai hoi, lai hoi, mai doi
tuc ban » thuc ban, truc ban, tu ban
ve cau » ke cau, va cau, ve cac
tu cam » tu cham, tu cac, tu nam
va cao » va cac, va co, va dao
cam ky » cao ky, cac ky
ve cam » ve cham, ve cac, va cam

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 cam ky nang ((mai hoi) OR (mai khoi)). hieu ((ve cam) OR (va cao)) tuc ban thanh ve cau tren~.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((mai hoi) or (mai khoi)). hieu ((ve cam) or (va cao)) tuc ban thanh ve cau tren*.