Perhaps you should try some spelling variations:
sach dao » lanh dao
qua pham » quan pham, quy pham, qua cham
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
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.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach v) or (sach dao)) nang x hoi. hieu qua pham duc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach dao)) nang x hoi. hieu qua pham duc va thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach dao)) nang x hoi. hieu qua pham duc va thanh vi cua tre*.