I can't find my invoices or order history? please help, it would be much appreciated thanks :)

I've been having trouble with finding out my order history for the apps I've purchased over any period of time, I've been on iTunes and it tells me there are no orders i have made and I go into my emails where I would usually have all my invoices and only 1 appears. I know I've had my Apple ID for longer then 12months (can't remember exactly) and i know that i have purchased apps within 2-4 weeks of now.