I just uploaded an image of a page from a baptism register, where as a service to my fellow genealogists I filled in the names of all the children with the surnames of both parents in the box marked Add a comment for others who see this photo.
I wondered whether a search on both names would hit that box (obviously if it does, such boxes are highly useful and I would propose that all of us make an effort to provide such information).
Result, negative. Unfair to do that so soon, so I tried one of the older images on this profile and cut-and-pasted some words directly from its comment box into the search box. These words were:
Gertruida VAN ZYL
and they appear in the comment to an image that was uploaded well over a year ago.
Result, three hits to other images where the words do not appear consecutively, but not to this one. I studied all three carefully but could not figure out why they were found but not the profile I want.