Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ca » thanh cha, thanh cac, thanh ha
truc ban » thuc ban, truc dan, truc van
cac truc » cau truc, cac tru, cac trung
tu sach » thu sach, su sach, tu cach
qua cac » cua cac
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
v nang » va nang, vu nang, van nang
ca cua » co cua

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) or (te sach)) v nang ((le hoi) or (ma hoa)). hieu qua cac truc ban thanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) v nang ((le hoi) OR (ma hoa)). hieu qua cac truc ban thanh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) v nang ((le hoi) or (ma hoa)). hieu qua cac truc ban thanh ca cua tre*.