Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
te sach » toc sach
sach vu » sach va, sach tu, sach uu
cao xuc » cam xuc, cao duc, cao suc
su tien » su kien, su hien, tu tieng
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
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 vu nang ((o hoi) OR (x ho)). hieu va cao xuc ((van hanh) OR (van thanh)) ve su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang ((o hoi) or (x ho)). hieu va cao xuc ((van hanh) OR (van thanh)) ve su tien~".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang ((o hoi) or (x ho)). hieu va cao xuc ((van hanh) OR (van thanh)) ve su tien*.