Perhaps you should try some spelling variations:
su sach » vu sach
hanh ve » hanh vi, hanh va, hanh kem
hanh de » hanh kem
luc ban » duc ban, cuc ban, luc bat
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ke » hieu kem, chieu ke, hieu ky
xay hoi » xa hoi, tay hoi, cay phoi
so sach » so sanh, bo sach, co sach
ky van » ly van, ty van, ky va
ke cau » ket cau

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) OR (so sach)) ky van xay hoi. hieu ke cau luc ban ((hanh de) OR (hanh ve)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky van xay hoi. hieu ke cau luc ban ((hanh de) OR (hanh ve)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky van xay hoi. hieu ke cau luc ban ((hanh de) OR (hanh ve)) cua tre*.