Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
dang xay » dang van, van xay
doanh va » doan va, doanh tai, doanh cua
su sach » so sach, vu sach
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
dang xa » lang xa, dang ha, dang va
co sach » bo sach, cuon sach, hoc sach
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (co sach)) ky ((dang xa) OR (dang xay)) hoi. lieu va cau luc van doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky ((dang xa) OR (dang xay)) hoi. lieu va cau luc van doanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky ((dang xa) OR (dang xay)) hoi. lieu va cau luc van doanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky ((dang xa) OR (dang xay)) hoi. lieu va cau luc van doanh va cua tre*.