I've installed aptoide, it's an app repository downloadable here (it's also on Google Play if you had rooted your Vox) :
http://aptoide.com/cli_install.html
and use m.apps.bazaarandroid.com to find apps getjar doesn't have. They have angry birds space at this url:
http://m.apps.bazaarandroid.com/app/...0Birds%20Space
Aptoide can also be installed from bazaars home page, just hit the "home" link at the top of the page for the angry birds app.
I haven't encountered any problems with any apps gotten from this site so far...
Edit: Note that you need to have Aptoide installed to download the apps at this site.