Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nhan luc » nang luc
sach vu » sach va, sach tu, sach uu
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach
hieu cu » hieu cua, hieu su, nhieu cau
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
hieu ca » hieu cac, hieu cua, hieu va
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 cu) OR (hieu ca)) 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 cu) OR (hieu ca)) nhan luc van hanh ((ve su) OR (va su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach vu nang ma hoi. ((hieu cu) OR (hieu ca)) nhan luc van hanh ((ve su) or (va su)) triet*".