Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
dau tren » dau tien, dat tren, dau tieng
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
ca tren » cau tren, cu tren, la tren
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
tu sac » tu sach, tu cac, tu san

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: tu sac ky ((nang xa) OR (nang x)) hoi. hieu va cham luc va hanh ve ((dau tren) OR (ca tren))~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang x)) hoi. hieu va cham luc va hanh ve ((dau tren) or (ca tren))*.