Make Results Be Ordered By Relevance

I bought a script and I need part of it to be modified.
In the attachment, you can see a non-boolean search, i dont know what type of search it is.
I need the results of this search be ordered by relevance
Example: We search for 3 keywords: red + green + black
The results will be ordered (3 words / 3 words) then (2 words / 3
words) then (1 word / 3 words)

All funcionalities of this script must be kept, including the accent insensibilty!

SEE THE FILE IN ATTACHMENT

I WONT ACCEPT BID FROM UNKNOWN PROGRAMMERS

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