Joomla search : code to enjhance the search of virtuemart

I need a code to allow a search string : box1+box2+box3+box4+box5 = search results in virtuemart obviously a visitor could just enter 5 keywords in the current search box and get the same result but this will allow me to promt them to enter the preferred keywords. I would like to be able to use this enhanced search module on multiple sites so if it was a code I could insert or similar that would be fine