Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
duc ban » duc tan, duc van, dua ban
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cua te » cua tu

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 lam duc ban thanh ve ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty hang)) xa hoi. hieu van lam duc ban thanh ve ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) xa hoi. hieu van lam duc ban thanh ve ((cua tre) OR (cua te))*.