Formula needed to find best match

Please see the attached sheet.

I want a formula to find the best (closest) match within a list and return and item code.

Been searching all over the internet and haven't had any luck.

It probably has to be a pretty complex formula for example i want to return "COKE DIET FREE" if the string is "Caffeine Free Diet Coke" or "Caffeine Free Coke Diet".

I hope I explained it well enough....

The worksheet kind of helps..

Thanks in advance.