Perhaps you should try some spelling variations:
nhan luc » nang luc
vanh dai » van dai, lanh dao, van dao
vanh tai » van tai, hanh tai, anh tai
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
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 sach ky dang xa hoi. hieu va nhan luc va ((vanh dai) or (vanh tai)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu va nhan luc va ((vanh dai) OR (vanh tai)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu va nhan luc va ((vanh dai) or (vanh tai)) cau tren*.