Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sai » tu bai, tu san, tu lai
tu cai » tu cac, tu can, tu bai
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sai) or (tu cai)) ky nang xa hoi. hieu qua cham luc ((va hanh) or (va dan)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu cai)) ky nang xa hoi. hieu qua cham luc ((va hanh) OR (va dan)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sai) or (tu cai)) ky nang xa hoi. hieu qua cham luc ((va hanh) or (va dan)) dai cua tre*.