Firebase - Lấy tất cả con của 1 nút về

Goc.child("Nhut").addChildEventListener(new ChildEventListener() {
    @Override    public void onChildAdded(DataSnapshot dataSnapshot, String s) {
       // Toast.makeText(getApplicationContext(), "" + dataSnapshot.getValue().toString(), Toast.LENGTH_SHORT).show();    }

    @Override    public void onChildChanged(DataSnapshot dataSnapshot, String s) {
        Toast.makeText(getApplicationContext(), "Sửa" , Toast.LENGTH_SHORT).show();
    }

    @Override    public void onChildRemoved(DataSnapshot dataSnapshot) {
        Toast.makeText(getApplicationContext(), "Xóa" , Toast.LENGTH_SHORT).show();
    }

    @Override    public void onChildMoved(DataSnapshot dataSnapshot, String s) {

    }

    @Override    public void onCancelled(DatabaseError databaseError) {

    }
});