How to Write a jtable with vietnameses in java

Here is my code to write my Jtable to excel. Its working but with error. Something was wrong with charater vietnameses
What should i do?

JFileChooser chooser = new JFileChooser();
int i = chooser.showSaveDialog(this);
if (i == JFileChooser.APPROVE_OPTION) {
    FileWriter out = null;
    try {
        File file = chooser.getSelectedFile();
        out = new FileWriter(file + ".xls");
        BufferedWriter bwrWriter = new BufferedWriter(out);

        DefaultTableModel model = (DefaultTableModel)tblSell2.getModel();

        for(int j =0 ; j <model.getColumnCount(); j++) {
            bwrWriter.write(model.getColumnName(j) + "	");
        }
        bwrWriter.write("
");

        for(int j = 0; j <model.getRowCount(); j++) {

            for(int k = 0; k<model.getColumnCount(); k++) {
                bwrWriter.write(model.getValueAt(j, k) + "	");
            }
            bwrWriter.write("
");
        }
        bwrWriter.close();
        JOptionPane.showMessageDialog(this, "Saved");
    } catch (IOException ex) {
        Logger.getLogger(JPSell.class.getName()).log(Level.SEVERE, null, ex);
    }
    finally {
        try {
            out.close();
        } catch (IOException ex) {
            Logger.getLogger(JPSell.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}