Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
cau tren » cu tren, dau tren, cau treo
danh ve » dinh ve, hanh ve, anh ve
va danh » va dinh, va dan, va hanh
va cham » va chat, va tham
ca tren » cu tren, la tren, co 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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (nang x)) hoi. hieu va cham luc va danh ve ((cau tren) OR (ca tren))~.
• 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 danh ve ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (nang x)) hoi. hieu va cham luc va danh ve ((cau 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 danh ve ((cau tren) OR (ca tren))*.