Perhaps you should try some spelling variations:
su sach » so sach, vu sach
xuc ban » duc ban, cuc ban, quoc ban
xuc van » duc van, luc van, thuc van
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
ly vang » ly hang, ly van, ly quang
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ly vang) or (ty xang)) cao hoi. hieu va cao ((xuc van) or (xuc ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly vang) OR (ty xang)) cao hoi. hieu va cao ((xuc van) OR (xuc ban)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ly vang) or (ty xang)) cao hoi. hieu va cao ((xuc van) or (xuc ban)) hanh vi cua tre*.