Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh ve » hanh ve, thanh va, thanh vien
sach vu » sach tu, sach uu, sach xu
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
cao vuc » cao duc, cao suc, cao vu
vuc van » duc van, luc van, thuc van
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, 5 hoi
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: su ((sach vu) OR (sach va)) nang ((x hoi) or (x ho)). hieu va cao vuc van thanh ve su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vu) OR (sach va)) nang ((x hoi) OR (x ho)). hieu va cao vuc van thanh ve su kien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vu) OR (sach va)) nang ((x hoi) or (x ho)). hieu va cao vuc van thanh ve su kien".
• Adding a wildcard symbol may retrieve word variants: su ((sach vu) OR (sach va)) nang ((x hoi) or (x ho)). hieu va cao vuc van thanh ve su kien*.