Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cao duc » dao duc, cao suc, giao duc
hanh ve » hanh vi, hanh va, hanh kem
sach va » sach xa, sach ha, sach dao
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach vu » sach tu, sach uu, sach xu
cao xuc » cam xuc, cao suc, chat xuc
ve su » va su
kien » bien, vien, tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach vu) OR (sach va)) nang xa hoi. hieu va ((cao xuc) or (cao duc)) van hanh ve su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach vu) OR (sach va)) nang xa hoi. hieu va ((cao xuc) OR (cao duc)) van hanh ve su kien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach vu) OR (sach va)) nang xa hoi. hieu va ((cao xuc) or (cao duc)) van hanh ve su kien".
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) OR (sach va)) nang xa hoi. hieu va ((cao xuc) or (cao duc)) van hanh ve su kien*.