Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
doanh vi » doanh va, doan vi, doanh vien
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, ky tang
van hoe » van hoc, van hieu, van hien
hieu ve » hieu va, hieu van
cam cuu » cham cuu
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

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