Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
dao cua » dai cua, day cua, dan cua
hieu va » lieu va, hieu qua
sach tu » cach tu, sach ty, sach uu
cua tre » cua te, cuu tre, cua triet
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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: te ((sach thu) OR (sach tu)) nang x hoi. hieu va cac ((luc va) OR (tuc va)) lanh dao cua tre~.
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach tu)) nang x hoi. hieu va cac ((luc va) or (tuc va)) lanh dao cua tre*.