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

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 va cham luc ((va hanh) or (va dan)) vi 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 va cham luc ((va hanh) OR (va dan)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) OR (tu cai)) ky nang xa hoi. hieu va cham luc ((va hanh) or (va dan)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) OR (tu cai)) ky nang xa hoi. hieu va cham luc ((va hanh) or (va dan)) vi cua tre*.