Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va
cuu tre » cua tre, cau tren, cau treo
vu nang » vuc nang, va nang, vu dang
v nang » va nang, van nang, voi nang
va anh » van anh, va danh, va hanh
anh va » hanh va
va cuu » va cau, va chu, va huu
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: tu sach ((v nang) or (vu nang)) x hoi. ((hieu ve) OR (hieu van)) cao duc va anh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (vu nang)) x hoi. ((hieu ve) OR (hieu van)) cao duc va anh va cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) or (vu nang)) x hoi. ((hieu ve) OR (hieu van)) cao duc va anh va cuu tre*".