Including "&" in search results

I know you have a solution already out there to include the ampersand. But it doesn’t seem to quite work all the way.

For Example: I have search setup to search terms of a Custom Tax. One of my terms is named, “S&C Electric”

“&” – works, returns an array of terms
“S&” – works, returns an array of terms
“S&C” – Doesn’t work, returns an empty array.

Because I have an empty array, I can’t iterate through my terms to show search results.

Any help would be greatly appriciated. Thanks.

FYI, I also have a term, “S&D Tech” that gets the same results as above.

https://wordpress.org/plugins/relevanssi/