Can't find certain apps?! + App Store empty screen partial

Hey Guys,

i bought an iPad Air 2 running iOS 9.3.1 and its my first Apple product so i struggle sometimes!

My problem is that i can't find a lot of Apps in the Store, it appears very empty to me compared to the Google Play Store!?

But if i search the Web for a specific app i get linked to the App Store and i am able to download the App!

BUt if i search it directly within the Store i am not able to find ist???

why????

greetings