Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
tang van » dang van, hoang van, trong van
lam luc » lao luc, lam duoc
hanh ve » hanh vi, hanh va, hanh kem
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach
hieu va » hieu qua
ve va » ve van, te va, ke va

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 y ((nang cao) or (tang van)) hoi. ((hieu va) or (lieu va)) lam luc van hanh ve va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang cao) OR (tang van)) hoi. ((hieu va) OR (lieu va)) lam luc van hanh ve va triet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang cao) or (tang van)) hoi. ((hieu va) or (lieu va)) lam luc van hanh ve va triet*.