Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh nhan, doanh luan
doanh van » doan van, doanh va, doanh nhan
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
cau xuc » cam xuc, cau luc, cau truc
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
sach ky » sac ky, sach y, sach ty
dang xa » lang xa, dang ha, dang va
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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 ((dang xa) or (dang xay)) hoi. hieu van cau xuc va ((doanh van) or (doanh ban)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang xa) OR (dang xay)) hoi. hieu van cau xuc va ((doanh van) OR (doanh ban)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang xa) or (dang xay)) hoi. hieu van cau xuc va ((doanh van) or (doanh ban)) cua tre*.