Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
va cham » va chat, va tham
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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 ma 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 ma 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 ma hoi. hieu va cham luc ((va hanh) or (va dan)) vi cua tre*.