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
cuc ban » cua ban, cac ban, cuu ban
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
ve cham » ve chat, vu cham, ve chim
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
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 tang)) xa hoi. hieu ((ve cham) OR (va cham)) cuc ban doanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky tang)) xa hoi. hieu ((ve cham) OR (va cham)) cuc ban doanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) or (ky tang)) xa hoi. hieu ((ve cham) OR (va cham)) cuc ban doanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) or (ky tang)) xa hoi. hieu ((ve cham) OR (va cham)) cuc ban doanh vi cua tre*.