make app name searchable

I have an app named BostApp, when I try to rename it to Bost, it failed with an error says the name has been taken, so I named it as 'Bost - connect locally', it is accepted. However when searching for word 'Bost' in Apple Store, it does not show up, neither does the other app Bost, but other app like Boost display though. similarly I named another my app 'SendHub - simply delivered', when searching word 'SendHub' , both my app and the other app SendHub show up. please advise how to make my app searchable under name Bost