Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
cham cuu » cap cuu, chat cua
hieu va » lieu va, hieu qua
cuu ban » cuu van, cua ban, cuu san
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
su tai » su thi, tu tai
di cua » dai cua, doi cua, de cua
su dai » sau dai, si dai, su hai
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su dai) or (su tai)) ky nang ((x hoi) OR (o hoi)). hieu va cham cuu ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su dai) OR (su tai)) ky nang ((x hoi) OR (o hoi)). hieu va cham cuu ban thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su dai) or (su tai)) ky nang ((x hoi) OR (o hoi)). hieu va cham cuu ban thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su dai) or (su tai)) ky nang ((x hoi) OR (o hoi)). hieu va cham cuu ban thanh di cua tre*.