Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
thu sach » tu sach, thuat sach, thuoc sach
doanh vi » doanh va, doan vi, doanh vien
cuu ban » cuu van, cua ban, cuu san
ve cham » va cham, ve chat, vu cham
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
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: thu sach ((ky lang) or (ky 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: thu sach ((ky lang) OR (ky dang)) van hoi. hieu ((ve cham) OR (ve cac)) cuu ban doanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) or (ky dang)) van hoi. hieu ((ve cham) or (ve cac)) cuu ban doanh vi cua tre*.