Perhaps you should try some spelling variations:
nhan luc » nang luc
cau tren » cu tren, dau tren, ca tren
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
danh ve » dinh ve, hanh ve, anh ve
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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 nhan luc va ((danh ve) or (dinh van)) cau 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 nhan luc va ((danh ve) OR (dinh van)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang x)) hoi. hieu va nhan luc va ((danh ve) or (dinh van)) cau tren*.