Fix comparison function on a Wordpress theme

The website is mummysupermarket.com

Please look at the website before sending a proposal,
Only detailed proposals will be considered.

The website is a price comparison site for children's products,
I'm using a theme from premium press called "compare"

The theme itself only gives 2 options to compare products,
Either
option 1. Exact title match
Option 2. "5 character word match"

The exact title match is too exact.
Obviously different merchants list their products with different titles,
So unless the titles match 100%, it doesn't work.

The 5 character word match is too vague,
The current settings on the website are set at 5 character word match.

As you see when you visit the site the compared products are not matching the current product you are viewing.

I need someone to edit the comparison query so that it matches titles with a 75% match,
If you think you are capable of This I would like a detailed proposal.

The time frame for this is asap!
I need it to be completed within the next 2 days.

I look forward to building a long term relationship with a developer.

Attached is an image of the file that contains the comparison query
Thank you