Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
lam duc » lam duoc, pham duc, nam duoc
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
thi van » thi lan, thi hanh, thi nang
sach vu » sach va, sach tu, sach uu
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu nang xa hoi. ((hieu van) OR (((thien van) OR (thi van)))) lam duc ban thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu nang xa hoi. ((hieu van) or (((thien van) OR (thi van)))) lam duc ban thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang xa hoi. ((hieu van) or (((thien van) OR (thi van)))) lam duc ban thanh vai cua tre*.