Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, hieu ve
thanh ve » hanh ve, thanh va, thanh vien
duc ban » duc tan, duc van, dua ban
lam duc » lam duoc, pham duc, nam duoc
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te 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 ((ty nang) OR (ty hang)) xa hoi. ((hieu van) OR (lieu va)) lam duc ban thanh ve cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty hang)) xa hoi. ((hieu van) OR (lieu va)) lam duc ban thanh ve cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) xa hoi. ((hieu van) OR (lieu va)) lam duc ban thanh ve cua tre*.