Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach dao » lanh dao
hieu va » lieu va, hieu qua
hanh ve » hanh vi, hanh va, hanh kem
xuc van » duc van, luc van, vuc van
cao xuc » cam xuc, cao duc, cao suc
su tien » su kien, su hien, tu tieng
sach va » sach xa, sach ha, sach nha
va cao » va cac, va co, va dao
o hoi » co hoi, o hoc, o hai
ve su » va su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach va) OR (sach dao)) nang ((o hoi) OR (x ho)). hieu va cao xuc van hanh ve su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach va) OR (sach dao)) nang ((o hoi) or (x ho)). hieu va cao xuc van hanh ve su tien~".
• Adding a wildcard symbol may retrieve word variants: te ((sach va) OR (sach dao)) nang ((o hoi) or (x ho)). hieu va cao xuc van hanh ve su tien*.