Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
su cham » su pham, tu cham, vu cham
hieu su » hieu sau, tieu su, hieu so
nang ma » tang ma, sang ma, mang may
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 2) OR (sach y)) ((nang ma) OR (nang cao)) hoi. hieu su cham luc va dan vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach 2) or (sach y)) ((nang ma) OR (nang cao)) hoi. hieu su cham luc va dan vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: te ((sach 2) or (sach y)) ((nang ma) OR (nang cao)) hoi. hieu su cham luc va dan vi cua tu*.