Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu sau » hieu su, hieu suat, tieu su
thanh ve » hanh ve, thanh va, thanh vien
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
lap hoi » lap doi, lai hoi, lap hai
chan xu » chang xu, nhan xu, han xu
ve cua » le cua, de cua, te cua
tu sai » tu bai, tu san, tu cai
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ((ky sang) or (ky dang)) lap hoi. hieu sau ((chan xu) OR (chao xu)) ban thanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ((ky sang) OR (ky dang)) lap hoi. hieu sau ((chan xu) OR (chao xu)) ban thanh ve cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ((ky sang) or (ky dang)) lap hoi. hieu sau ((chan xu) OR (chao xu)) ban thanh ve cua te".
• Adding a wildcard symbol may retrieve word variants: tu sai ((ky sang) or (ky dang)) lap hoi. hieu sau ((chan xu) OR (chao xu)) ban thanh ve cua te*.