Searching for items with vendor code containing hyphens - does not work properly

[#1]

Search functionality with - 

I create a lot of purchase orders with vendor item numbers. They come in many different formats, some letters "DOBUSBRN", some numbers "523456", some letters and numbers "D35931". They call all be searched for with  great precision. Except for when (and the most common format for me) they contain a "-" example: "102-3557"

Any item containing a - makes search almost unusable listing items not even associated with the code. I believe this is a bug, but I could be wrong...