Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
dau xac » dau xay, dan xac
van anh » van thanh, van minh
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
va dau » va dao
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho
tuan » quan, tran, luan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (vu bach)) v nang x hoi. hieu va dau xac ((van anh) or (tuan anh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (vu bach)) v nang x hoi. hieu va dau xac ((van anh) OR (tuan anh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (vu bach)) v nang x hoi. hieu va dau xac ((van anh) or (tuan anh)) vi cua tre*.