Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh de » thanh ve, thanh do, thanh le
su sach » vu sach
hanh de » hanh ve, hanh kem
luc ban » duc ban, cuc ban, luc bat
cac luc » cau luc, coc luc, cac nuoc
van cac » van hac, van cau, van bac
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet

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