Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
phai la » phai lam, phan lap, phan lan
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
phi la » phi va, phu la, phi ha
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. ((hieu van) OR (hieu va)) chau ((phi la) OR (phai la)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. ((hieu van) or (hieu va)) chau ((phi la) or (phai la)) hanh vi cua tre*.