Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cai ky » cao ky, cac ky, cam ky
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 ve cham luc ((va hanh) or (va danh)) di ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky lang xa hoi. hieu ve cham luc ((va hanh) OR (va danh)) di ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky lang xa hoi. hieu ve cham luc ((va hanh) or (va danh)) di ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu cai ky lang xa hoi. hieu ve cham luc ((va hanh) or (va danh)) di ((cua tre) OR (cuu tre))*.