I made this hack to VM.
It allows search in any language, i.e whatever the language selected, it searchs in ALL languages (if the translation is published).
First, i tried to make a search only in the selected language but it's very complex due to the default language feature (which is a significant difference with OScommerce).
But, on second thought, it appeared a good idea to allows customers to find products without take care of language.
It works with module 'mod_virtuemart_search.php' or 'mod_virtuemart.php' and also component page 'shop.search'
I modified a VM page so if you install a new version of VM, all changes will be lost.
There must remains some bugs, so if you can test it and feed back, it wil help me.
This file is \administrator\components\com_virtuemart\html\shop_browse_queries.php
[attachment cleanup by admin]