Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
sang lai » sang tai, sang lap, mang lai
hieu sau » hieu su, hieu suat, tieu su
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lai hoi » dai hoi, lai hoa, lai roi
ky sang » ky nang, ky dang, ky tang
xu ban » xuc ban, tu ban, vu ban
cua tu » cua tuc, cua su, cua cu

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

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