My experience with Google search auto-show results is less than ideal and I really wonder if it's been UX/User tested or if it's just "hey, it's cool we can do

My experience with Google search auto-show results is less than ideal and I really wonder if it's been UX/User tested or if it's just "hey, it's cool we can do this so let's do it" The problem comes up when I search for something. I then want to make a new search referencing something I see in the current search but as soon as I start typing the very text I'm referencing disappears. It's very frustrating.