Perhaps you should try some spelling variations:
tra nang » thi nang, kha nang, da nang
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
van lam » van nam
lam cuc » lam cua, lam duoc, pham cuc
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ((tra nang) OR (truc nano)) xa hoi. hieu van lam cuc ban hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tra nang) or (truc nano)) xa hoi. hieu van lam cuc ban hanh vi cua tre*.