Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
cua tre » cua te, cuu tre, cua triet
hieu so » thieu so
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu su » hieu sau, tieu su, hieu suat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cai ky » cao ky, cac ky, cam ky
di cua » dai cua, doi cua, de cua
tu cai » tu cac, tu can, tu bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cai ky lang xa hoi. ((hieu su) OR (hieu so)) cham luc ((va hanh) or (va danh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky lang xa hoi. ((hieu su) OR (hieu so)) cham luc ((va hanh) OR (va danh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky lang xa hoi. ((hieu su) OR (hieu so)) cham luc ((va hanh) or (va danh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cai ky lang xa hoi. ((hieu su) OR (hieu so)) cham luc ((va hanh) or (va danh)) di cua tre*.