I've used Viart for quite sometime and I if I know one thing is that settings to accomplished tasks seemed to be spread all over the place, so I almost positive I'm missed a step. With that said please help.
 
What you need to know:
 
1. Site is a book store.
2. I created a product option "Label" to be used to display the ISBN numbers.
3. In "settings/product settings/advance search" I have checked the ISBN box so that is shows on the advance search page.
4. Search ISBN option appears on advance search page
5. Viart Version 4.1
 
The problem:
 
Normal or advance search does not bring up any results for matching ISBN numbers.
 
Thanks in advance

It seems to work for me. Please contact our support team with login data to your site, we will check how it works there.
 
Regards,
ViArt Team