How to search/replace breath sound with a silence?

I am recording audio books for commercial sale.  Every chapter in a given book is recorded in a different file.  I need to search and replace all and every breath sound with a silence in all files. 

I have tried the suppress sound command and the reduce noise command after having selected a given breath sound but the result in not satisfying because it does alter the sound of the voice.

How can I do this? Is it just a question of adjusting the different sliders? Or what?!?

Right now I am manually selecting every breath sound and replacing it with a silence using a keyboard  shortcut that I have created but it takes me hours to do so. 

If there were a kind of search and replace command like in Microsoft Word I could select the breath sound and then replace all of them in seconds (instead of hours!)

Can someone help me with this?