Unfortunately, clixsense does not guarantee you will become 'rich' when you participate in their website.
Some countries do not receive much tasks and offers. The best way for is to get lots of referrals. Of course, its easy to say 'get referrals' when in reality it is hard. But the important thing is not to give up.
If you dont have much tasks and offers, (which i take for granted all of the time) your BEST bet is to promote your link and get some handy referrals. Referrals can take a while but it is very rewarding. 100 active referrals could earn you a lot.
referrals + ads + clixgrid = the way to success 4 U!