Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, chat lua
cham cuu » cap cuu, chat cua
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » co hoi, cao hoc, tao hoi
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((cao hoi) OR (cau hoi)). hieu vu ((cham luc) OR (cham cuu)) van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((cao hoi) or (cau hoi)). hieu vu ((cham luc) OR (cham cuu)) van hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((cao hoi) or (cau hoi)). hieu vu ((cham luc) OR (cham cuu)) van hanh vi cua tre*.