Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
nang xa » lang xa, nang ma, mang xa
va cham » va chat, va tham
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: vu sach y ((nang xa) OR (nang x)) hoi. lieu va cham luc ((van hanh) OR (ban hanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((nang xa) OR (nang x)) hoi. lieu va cham luc ((van hanh) or (ban hanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) OR (nang x)) hoi. lieu va cham luc ((van hanh) or (ban hanh)) vi cua tre*.