Delete a Message
Once on the page, in case there are a lot of comments, a Ctrl+F allows to quickly find it again 
Ctrl+F, Ctrl+/ or F3. I'm used to it
For the search of multiple words, as it is just a SQL "LIKE", you can put a "%" between two words to search with anything between these words.
I hope there is at least a htmlentities or a htmlspecialchars somewhere to avoid a full SQL injection
