Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu van
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
luc van » luoc van, luu van, duc van
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, 5 hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang ((x hoi) OR (x ho)). ((hieu ve) OR (hieu va)) cau luc van thanh san cua tre~.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang ((x hoi) or (x ho)). ((hieu ve) or (hieu va)) cau luc van thanh san cua tre*.