Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh nhan, doanh luan
doanh van » doan van, doanh va, doanh nhan
te sach » toc sach
sach sy » sach y, sach ty, sach hay
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
sy long » sy luong, quy long
cac tu » cac thu, cach tu, cac du
tu vay » tu va, tu van, tu cay
ha hoi » hoa hoi, ha noi, va hoi
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach sy long ((ha hoi) OR (xa hoi)). hieu ve cac tu vay ((doanh van) or (doanh ban)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach sy long ((ha hoi) OR (xa hoi)). hieu ve cac tu vay ((doanh van) OR (doanh ban)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach sy long ((ha hoi) OR (xa hoi)). hieu ve cac tu vay ((doanh van) or (doanh ban)) cua tre*".