Manage how user searches for app on Google Play

I have published an app on Google Play titled: ex. 'The Full App Name' abbreviated 'TFAN'

When searched for 'tfan', the app is displayed, but when searched for 'the full app name', there are no results.

This is a snippet from AndroidManifest.xml

<application
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_short_name" // TFAN
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

Why is this happening?

If possible, can you let me know a workaround?

Thanks.