Imagine that you are looking for pentest apps in the Google Play Store, that's the URL you got:

https://play.google.com/store/search?q=pentesting

By default, Google only shows you apps that are available in your region.

But it might be the case that you are interested to look for android apps in a particular region. For that, just add at the end ( &gl=au ):

https://play.google.com/store/search?q=pentesting&gl=au

This is the countries code you can use: https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2