Comment 7 for bug 1602154

it seems to be the dash in the search term that breaks it:

ogra@styx:~$ snap find calculator
Name Version Developer Notes Summary
ubuntu-calculator-app 2.1+snap3 ubuntucoredev - Ubuntu Calculator application for the Unity 7 desktop

vs:

ogra@styx:~$ snap find ubuntu-calculator-app
Name Version Developer Notes Summary
apktool 2.1.1 ligboy - A tool for reverse engineering 3rd party, closed, binary Android apps.
audovia 3.3.1 songbuilder - Database application for making music using JFugue MusicStrings
blender-tpaw 2.77a tpaw - Blender is the free and open source 3D creation suite.
bluez 5.37-1 canonical - Bluez for Ubuntu
...

vs:

ogra@styx:~$ snap find calculator-app
Name Version Developer Notes Summary
apktool 2.1.1 ligboy - A tool for reverse engineering 3rd party, closed, binary Android apps.
audovia 3.3.1 songbuilder - Database application for making music using JFugue MusicStrings
blender-tpaw 2.77a tpaw - Blender is the free and open source 3D creation suite.
gdoc-html-cleaner 0.1.2 caldav - Download Google Docs as cleaned HTML files
gtwang-demo 1.0 gtwang - G.T.Wang demo application.
...

vs:
ogra@styx:~$ snap find ubuntu-calculator
Name Version Developer Notes Summary
bluez 5.37-1 canonical - Bluez for Ubuntu
canonical-pc-linux 4.4.0-18+20160419.13-26 canonical - The ubuntu-core kernel snap
click-parser 3.0.5 bhdouglass - Extract data from Ubuntu's click & snap packages
krita 3.0-snap12 krita - Krita: the free digital painting studio
...