Search on Apple TV
Apple TV includes a Search app 
that can help you locate films, TV prgrammes, cast and crew information, apps in the App Store 
and even music if you’re an Apple Music subscriber.
Search using the onscreen keyboard.
Highlight the Search app
on the Home screen of Apple TV, then press the Touch surface of the Siri Remote.Type your query using the onscreen keyboard.
The Search app returns content associated with your search terms.
Tip: You can use the keyboard on a nearby iPhone or iPad to enter text directly on Apple TV instead of using the Siri Remote. For more information, see Use the iOS keyboard to enter text on Apple TV.
For a list of apps included in searches, see the Apple Support article About Search on your Apple TV.
Note: Apps included in search results may vary based on region.
Dictate instead of typing
You can also enter search terms in the Search app using voice dictation.
Press and hold the Siri button
on the Siri Remote, then speak.