Search for "author:(Tolstoy%2C%20Leo%2C%20graf%2C%201828-1910) title:(The%20slavery%20of%20our%20times%20%2F)" found nothing
Try limiting your search to just one of these... author:(Tolstoy%2C%20Leo%2C%20graf%2C%201828-1910) or title:(The%20slavery%20of%20our%20times%20%2F)
Try the "More search options" page.