How Google Sorts Apps in the Play Store:

When searching on Google Play, application search works across title, publisher and app descriptions. It's not easy to refine the search results appropriately when it comes to generic words that may also happen to be brand names or titles. For example, when a user searches for "Color Game", it's difficult to tell if the user is searching for an app named "Color Game" or for a game about colors. Because of this, we cannot guarantee that every app will display in search results for its name.

Please note, Google shows a limited number of search results in Google Play to ensure the best user experience. If your app's search rank for a specific term is too low, your app will not display in results. Keep in mind, however, that your app is always available by direct link, which you can share with users as you actively market your app. You can also recommend users search for your app’s name in quotes (i.e. "app name") to have their search engine look for that exact combination of words.

You can work to improve your app’s visibility by:

• Building a lasting and meaningful experience for your users
• Maintaining and improving your app through regular updates
• Encouraging users to provide feedback in the form of ratings and comments
• Providing great customer service by responding to your users and addressing issues

You can also check out these tips from Google’s PlayBytes video series: 
https://www.youtube.com/watch?v=MVBMWDzyHAI

We hope these suggestions help provide you with useful steps to improve your app's visibility on Google Play.

Please let us know if you have any additional questions.