Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
cua tre » cua te, cuu tre, cua triet
ban anh » ban hanh, ban banh, bang anh
di cua » dai cua, doi cua, de cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cai
nang o » nang co, nang ho, nang ro
va cao » va cac, va co, va dao
o hoi » co hoi, o hoc, o hai

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 nang o hoi. hieu ((va cam) OR (va cao)) quoc ((ban anh) or (ban danh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. hieu ((va cam) OR (va cao)) quoc ((ban anh) OR (ban danh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang o hoi. hieu ((va cam) OR (va cao)) quoc ((ban anh) or (ban danh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. hieu ((va cam) OR (va cao)) quoc ((ban anh) or (ban danh)) di cua tre*.