Php search engine for my site

Php search engine for my site

I have a Romanian based language site: http://www.firmelavedere.com with informations about business companies.

I implemented a simple php search engine for my website on pages like this on the top right corner:
http://www.firmelavedere.com/firme/Maramures-22.php

I want to add a new radio box field to select language for displayed text.

Is there a possibility to integrate Google Site Search with more languages?
How can i do that?

I need some code suggestions, to make this script run fast.

Thanks all,