Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach 2, sach vay
luc va » duc va, tuc va, loc va
dan vi » doan vi, dan va, gan vi
cua te » cua tu

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 va ((dan vi) OR (don vi)) 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 va ((dan vi) OR (don vi)) cua te~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu vu cham luc va ((dan vi) OR (don vi)) cua te*.