You need to use Google search widget on your site to be able to search in all languages.
I think you really did not read my post.
1. Google search it is not for professional sites because you will see advertising from Google. So it is not suitable for a serious site.
2. The point in my last post is concerning that I have created a solution for searching in different languages without google search.
2.1. I was trying google search, and when I was doing some test the google's robots blocked my ip address because of automatic queries... So google search, is not the candidate.
2.2. I really don't think that your suggestion is really seious as is really GTranslate
3. So here you have my site where you can see in action my search engine with three different languages.
4. The search results are in relation with database created by my solution.
5. My site is in Joomla
Here is the link:http://www.oswaldogonzalez.net/buscar
There you can do searching in three languages and the answers will be in the language previously selected by user.
I hope it will be interesting for you & maybe for Gtranslate users...