Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
van hanh » van thanh, ban hanh, van anh
duoc van » duoc va, duc van, duoc ban
lai hoa » dai hoa, loai hoc
su chet » se chet
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai roi, mai hoi
hieu su » hieu sau, tieu su, hieu so
vi cua » vai cua, di cua
tu bac » tu ban, tu bat, tu bai
cua te » cua tu

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 bac) OR (tu cac)) ky sang ((lai hoi) OR (lai hoa)). hieu su chet duoc van hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu bac) or (tu cac)) ky sang ((lai hoi) OR (lai hoa)). hieu su chet duoc van hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu bac) or (tu cac)) ky sang ((lai hoi) OR (lai hoa)). hieu su chet duoc van hanh vi cua te*.