Collecting Arabic tweets




I asked a similar question a few months back, but I need to ask again and get a resolution (if I can!).

Basically, i want to gather Arabic tweets - sounds simple, right? The problem i have is that if i use
a location bounding box i get very little stuff back (even if the box covers the whole world).

However, if i use keywords then i get more stuff back, but I dont want to use keywords, I just want Arabic tweets - not tweets filtered by keyword.

Im using Python 2.7, Tweepy and a MacBook.

Any advice appreciated.