Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
su sach » so sach, vu sach
ky mang » ke mang, ky dang, ky tang
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
dan hoi » dan hoc, dai hoi, van hoi
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
tay ho » tay co, tay o, tay khao
va dan » ca dan, va dao, va dau

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 ((ky mang) OR (ky nang)) tay ho. ((hieu van) OR (hieu va)) cac duc va dan hoi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky mang) OR (ky nang)) tay ho. ((hieu van) or (hieu va)) cac duc va dan hoi cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky mang) OR (ky nang)) tay ho. ((hieu van) or (hieu va)) cac duc va dan hoi cua tre*.