Multiple sub domain?

[bupati]

Hi guys,
I am trying to put multiple subdomain on my website, but it didn't worked...this is my conf of Virtual host on apache2 (debian)

                                                                       

<VirtualHost *:80>
ServerName www.testing.com

DocumentRoot /home/www/testing.com/htdocs
</VirtualHost>

<VirtualHost *:80>
ServerName www.testing1.testing.com
DocumentRoot /home/www/testing.com/htdocs/test1/htdocs
</VirtualHost>

<VirtualHost *:80>
ServerName www.testing2.testing.com
DocumentRoot /home/www/testing.com/htdocs/test2/htdocs
</VirtualHost>

<VirtualHost *:80>
ServerName testing3.testing.com
DocumentRoot /home/www/testing.com/htdocs/test3/htdocs
</VirtualHost>

Restart apache2 /etc/init.d/apache2 restart and I typed
http://testing3.testing.com or www.testing3.testing.com www.testing2.testing.com but it didn't worked... help pls?