Where can I get online data entry tasks to do?

Thanks for asking!

My answer would be in a form of  "task". In other words, I'd advice you on HOW (rather than WHERE)

to find such jobs.

Simply google for it! Simple answer but seems the best to me. An example site I googled myself was:

http://surejob.in/online-data-entry-jobs-from-home.html

Good luck!

I would suggest Freelancer.com