Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
ban hanh » ban hang
duoc ban » duc ban, quoc ban, buoc ban
cua tre » cua te, cua triet, dua tren
hanh de » hanh ve, hanh kem
tu sach » thu sach, su sach, te sach
cuu tre » cau tren, cau treo
va lam » van lam, va lap

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 ((tu nano) or (truc nano)) xa hoi. lieu va lam duoc ban hanh de ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nano) OR (truc nano)) xa hoi. lieu va lam duoc ban hanh de ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nano) or (truc nano)) xa hoi. lieu va lam duoc ban hanh de ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nano) or (truc nano)) xa hoi. lieu va lam duoc ban hanh de ((cua tre) OR (cuu tre))*.