Perhaps you should try some spelling variations:
nhan luc » nang luc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang ma » tang ma, sang ma, nang cao
hieu su » hieu sau, tieu su, hieu so
su nhan » cu nhan, tu nhan, su nha
luc van » luoc van, luu van, duc van
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach vu nang ma hoi. hieu su nhan luc van hanh ((ve su) or (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang ma hoi. hieu su nhan luc van hanh ((ve su) OR (va su)) triet*.