Yahoo archive search- search by key word?

Hi, a while back my yahoo account was hacked and someone deleted all the people on my contact list (I think I forgot to sign off when I was at school) and there were a few people I have not been able to remember there yahoo names and still havent been in contact with. However, like last year I had an archive reader where I can do a search and anyone who I chated with, and that specific word was type, they would be in the search results. For example…… if I had a convo and typed the word “spraybottle” in our chat, I can type “spraybottle” in the search box, and the search would filter all my chat reccords and show me every convo I had where I used the word “spraybottle”. I looked everywhere and can not find that software- does anyone know any program that would do that? thanks a ton!