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
cac tuc » cac toc, cac tu, cac tac
tuc xay » thuc xay, tuc xa, tu xay
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ha hoi » hoa hoi, xa hoi, 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 ky dang ((ha hoi) OR (ha noi)). hieu ve cac tuc xay ((doanh van) or (doanh ban)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((ha hoi) OR (ha noi)). hieu ve cac tuc xay ((doanh van) OR (doanh ban)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ((ha hoi) OR (ha noi)). hieu ve cac tuc xay ((doanh van) or (doanh ban)) cua tre*".