iOS Photos app - Any search options / tips?

[Sirolway]

Hi all

I'm trying to love Apple's new' (ish) Photos app on iOS but am struggling.
One thing that would make my photo browsing life better would be the ability to do boolean searches, like "face=john and favorite=yes"

I guess you can search on names or places, but

a. What else can you search on?
b. Can you do boolean (and, or) searches
c. I guess smart albums on iOS are impossible for now?
d. Are there any web sites out there with search tips for Apple Photos?

Any help would be much appreciated ...