I experimented a little bit searching for old photos that I knew existed but have had a hard time finding just like they described at IO today, the endless scrolling through past photos, and I found a few things that it could not find.
Never fear, find the old photos once, change their information/description using the desktop/browser version of photos and then a little while later they will be included in search results.
I don't know if it learned it by how I placed some similar photos into a named album or just indexed the info I added.
#Enhancement What this brings to mind is that the Photos app should ask every now and again to tag/add info/describe photos in your repository that it has issues assigning.
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