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