Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: so sach y nang x hoi. ((hieu ve) or (hieu va)) cam ((xuc van) or (duc van)) thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang x hoi. ((hieu ve) OR (hieu va)) cam ((xuc van) OR (duc van)) thanh san cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y nang x hoi. ((hieu ve) or (hieu va)) cam ((xuc van) or (duc van)) thanh san cua tre*.