Perhaps you should try some spelling variations:
ban hanh » ban hang
sang lai » sang tai, sang lap, mang lai
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
hieu su » hieu sau, hieu so, hieu suat
tieu su » thieu so
tu sac » tu sach, tu cac, tu san
cua te » cua tu
xu ban » xuc ban, tu ban, vu ban
sac ky » cac ky, sai ky
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang lai hoi. ((hieu su) or (tieu su)) chao xu ban hanh vi ((cua te) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang lai hoi. ((hieu su) OR (tieu su)) chao xu ban hanh vi ((cua te) OR (cua cu)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang lai hoi. ((hieu su) or (tieu su)) chao xu ban hanh vi ((cua te) or (cua cu))*.