Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
hanh ve » hanh vi, hanh va, hanh kem
cao luc » bao luc, cao suc, cau luc
vu dang » su dang, cua dang
su tien » su kien, su hien, tu tieng
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: te sach ((vu dang) or (vu quang)) xa hoi. lieu va ((cao luc) OR (cao duc)) van hanh ve su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((vu dang) OR (vu quang)) xa hoi. lieu va ((cao luc) OR (cao duc)) van hanh ve su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((vu dang) or (vu quang)) xa hoi. lieu va ((cao luc) OR (cao duc)) van hanh ve su tien".
• Adding a wildcard symbol may retrieve word variants: te sach ((vu dang) or (vu quang)) xa hoi. lieu va ((cao luc) OR (cao duc)) van hanh ve su tien*.