Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, toan doanh
ban danh » ban hanh, ban dan, van danh
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, ky tang
van hoi » van hoc, van hoe, van loi
hieu ve » hieu va, hieu van
cam cuu » cham cuu, cap cuu
vi cua » vai cua, di cua
tu ban » thu ban, te ban
ban ky » van ky, dan ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky lang ((van hoi) or (van hoa)). hieu ve cam cuu ((ban danh) OR (ban doanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky lang ((van hoi) OR (van hoa)). hieu ve cam cuu ((ban danh) OR (ban doanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ban ky lang ((van hoi) or (van hoa)). hieu ve cam cuu ((ban danh) OR (ban doanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ban ky lang ((van hoi) or (van hoa)). hieu ve cam cuu ((ban danh) OR (ban doanh)) vi cua tre*.