My Ipad 4 gen. wont find my Iphone on bluetooth, and Iphone wont find Ipad, is there some sort of tricky way to solve that ?
You cannot pair IOS devices using bluetooth, only headphones, keyboards etc. See IOS Supported Bluetooth profiles for more information.
What are you trying to accomplish? Bluetooth is almost certainly not the way to connect an iPhone and iPad.
This is from the iPad User Manual:
Retrieving data ...