Search for "author:(Thomas, Robert Moseley Bryce) title:(My reasons for leaving the Church of England and joining the Church of Jesus Christ of Latter-day Saints /)" found nothing
Try limiting your search to just one of these... author:(Thomas, or Robert or Moseley or Bryce) or title:(My or reasons or for or leaving or the or Church or of or England or and or joining or Jesus or Christ or Latter-day or Saints or /)
Try the "More search options" page.