Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
doanh vi » doanh va, doan vi, doanh vien
dang van » hoang van, hang va
su sach » vu sach
cuu ban » cuu van, cua ban, cuu san
ve cham » va cham, ve chat, vu cham
van hoi » van hoa, van hoc, van hoe
ty dang » ty xang, ky dang, ty hang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
vi cua » vai cua, di 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 (so sach)) ty dang van hoi. hieu ((ve cham) or (ve cac)) cuu ban doanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty dang van hoi. hieu ((ve cham) OR (ve cac)) cuu ban doanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty dang van hoi. hieu ((ve cham) or (ve cac)) cuu ban doanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty dang van hoi. hieu ((ve cham) or (ve cac)) cuu ban doanh vi cua tre*.