Just relax & wait. App doesn't show up in search result suddenly. You will have to wait for atleast a week or so for your app to appear in search results.

It works the same way in which Google website ranking works.

All you can do is -
1. Get more downloads on your apps
2. Get better ratings
3. Wait

Good Luck with your app!

Sent from my XT1022
Try My Application:

Most Addictive Math Game - Math On

Math On