Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
luc cac » luoc cac, tuc cac, duc cac
sach v » sach va, sach 2, sach vay
vi cua » vai cua
di cua » dai cua, doi cua, de 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: te ((sach v) OR (sach y)) nang xa hoi. hieu vu cham luc cac dan ((vi cua) OR (di cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang xa hoi. hieu vu cham luc cac dan ((vi cua) OR (di cua)) te~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu vu cham luc cac dan ((vi cua) OR (di cua)) te*.