Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
sang lai » sang tai, sang lap, mang lai
van hanh » van thanh, ban hanh, van anh
hieu so » thieu so
va hanh » va thanh, va danh, ban hanh
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
hieu su » hieu sau, tieu su, hieu suat
vai cua » dai cua, hai cua, lai cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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 sac ky sang lai hoi. ((hieu su) OR (hieu so)) chet duoc ((va hanh) OR (van hanh)) vai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang lai hoi. ((hieu su) or (hieu so)) chet duoc ((va hanh) OR (van hanh)) vai cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang lai hoi. ((hieu su) or (hieu so)) chet duoc ((va hanh) OR (van hanh)) vai cua te*.