You can see how the old search would have responded on the test server. The first pages are more or less the same as on the new search without quotes. Results like this are to be expected since Widmung (Liebeslied), S. 566 has no aliases currently. (I guess that’s the work you wanted to search for.)
This still isn’t the expected behavior however. Using a search like ("Widmung Dedication") explains what’s going on really well, I think:
