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 ve » hanh vi, hanh va, hanh kem
luc van » luoc van, luu van, duc van
hieu ca » hieu cac, hieu cua, hieu va
su sach » so sach
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
vu sach » vu bach, vu khach
hieu cu » hieu cua, hieu su, nhieu cau
ma hoi » mai hoi, xa hoi, ma hoa
ve su » va su

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) OR (vu sach)) vu nang ma hoi. ((hieu cu) or (hieu ca)) nhan luc van hanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) vu nang ma hoi. ((hieu cu) OR (hieu ca)) nhan luc van hanh ve su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) vu nang ma hoi. ((hieu cu) or (hieu ca)) nhan luc van hanh ve su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) vu nang ma hoi. ((hieu cu) or (hieu ca)) nhan luc van hanh ve su triet*.