Need advice to search specific on FB

Hi gang, do you have a way to be able to search for a comment in a post or the name of a particular person who has shared a comment or like?

Is there an advanced program for searching on facebook, an application for an add on in the browser?

I know that we can search from our browser for a particular word on our page but on facebook in there are 4000 comments and that you have to scroll down the messages within 2 hours to find the name afterwards with the search. just too long.

Thank you for your help !!!

I do not think there is any tool for this.