Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
nang xa » lang xa, nang ma, mang xa
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
va cau » van cau, va cac, va cao
va dau » va dao
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (nang x)) hoi. lieu va cham luc va hanh ((va cau) OR (va dau)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang x)) hoi. lieu va cham luc va hanh ((va cau) OR (va dau)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (nang x)) hoi. lieu va cham luc va hanh ((va cau) OR (va dau)) triet*".