Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
nhan luc » nang luc
hanh ky » hanh kem
luc van » luoc van, luu van, duc van
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
sach vu » sach va, sach tu, sach uu
vu sang » vua sang, vu dang, vu san
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » ma hoa, me hoi, va hoi

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 vu sang ((((ma hoi) or (xa hoi))) or (mai hoi)). hieu va nhan luc van hanh ky su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu sang ((((ma hoi) OR (xa hoi))) OR (mai hoi)). hieu va nhan luc van hanh ky su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach vu sang ((((ma hoi) or (xa hoi))) or (mai hoi)). hieu va nhan luc van hanh ky su triet*.