If you cannot find the application search on the device , it simply means that Google Play detects that your application is not compatible with the device you are looking for.
EDIT
There is no support-screens block in your manifest. Add:
<supports-screens android:anyDensity="true" android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:xlargeScreens="true" android:resizeable="true" />
and see that after this change, the supported device counter will be counted.
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