That second image providing 9 pages of results though? Is that what you need?
I've just done the same, searched Andy@, left the options clear and just ticked the feedback section and I returned 9 pages.
That's from a board though, maybe I misinterpreted what you asked - if you just mean a particular thread it can't be done. Perhaps use the 'search order' or 'message age' to try to narrow it to that thread.
What specifically are you looking for, if it isn't private perhaps I can help.