Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu dang » su dang, vu quang, cua dang
dang xa » dang xay, lang xa, dang ha
cao xuc » cam xuc, cao suc, chat xuc
cao duc » dao duc, cao suc, giao duc
su hien » su kien, su tien, thu hien
kem » kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach vu dang xa hoi. hieu qua ((cao xuc) or (cao duc)) van hanh kem su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu dang xa hoi. hieu qua ((cao xuc) OR (cao duc)) van hanh kem su hien.
• Adding a wildcard symbol may retrieve word variants: te sach vu dang xa hoi. hieu qua ((cao xuc) or (cao duc)) van hanh kem su hien*.