Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
mang tao » sang tao, nang tao, mang nao
hoi cua » hoi chuc
dan hoi » dan hoc, dai hoi, van hoi
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
su sach » vu sach
tao hoi » tao khoi, tao boi, tay hoi
ky mang » ky nang, ke mang, ky dang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
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) OR (so sach)) ky mang tao hoi. ((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) OR (so sach)) ky mang tao hoi. ((hieu van) or (hieu va)) cac duc va dan hoi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky mang tao hoi. ((hieu van) or (hieu va)) cac duc va dan hoi cua tre*.