Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
thanh ve » hanh ve, thanh vien, thanh van
su sach » so sach, vu sach
cao vuc » cao duc, cao suc, cao vu
vuc van » duc van, luc van, thuc van
su tien » su kien, su hien, tu tieng
sach uu » sach luu, sach tu, sach xu
hieu va » lieu va, hieu qua
uu nang » cuu nang, vu nang, cuu nong
va cao » va cac, va co, va dao
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 uu nang ((x hoi) or (o hoi)). hieu va cao vuc van ((thanh ve) or (thanh va)) su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach uu nang ((x hoi) OR (o hoi)). hieu va cao vuc van ((thanh ve) OR (thanh va)) su tien.
• Adding a wildcard symbol may retrieve word variants: su sach uu nang ((x hoi) or (o hoi)). hieu va cao vuc van ((thanh ve) or (thanh va)) su tien*.