Training a dog off the leash is something that is very much different than training a dog with the leash on. Of course, from the word itself, with the leash on, you can easily control your dog by simply tugging at the leash, and almost immediately (especially if you have trained your dog well), the dog will follow your command. However, without the leash on, making your dog follow your EVERY 
command is almost an impossible feat to achieve. However, some experts say that it is achievable, if you know the right and proper way to do it.
My definition of off leash dog training is a dog who will listen to your commands nearly 100% of the time (no dog is perfect) with or without a leash and with or without real distractions. How many of you reading this have dogs that perform at that level?
That is how experts in dog training define off leash dog training. It’s not the way most people think it is. If your dog is able to follow commands even if you’re out of the ten meter radius where he could see you, then I must commend you for a wonderful training you’ve done. However, if your dog can’t achieve it as of the moment, don’t despair. As the saying goes, try and try until you succeed, of course, with the help of the right persons of course.
And therein lies the rub. No one wakes up one morning and suddenly realizes, “Hey, I know how to get advanced obedience training with my dog!” Gaining this level of off leash obedience is best achieved by seeking out and finding experts. I’d never dream of re-building my transmission, I’d never even think of re-modeling my kitchen. These are things that I don’t know how to do and would likely screw up if I tried to attempt them on my own.
The same is true for this level of training with your dog. If you don’t know how to do it now you likely won’t ever know unless you enlist the help of those who have gone before you.
Well, without further adieu, start scouting for the best and expert dog trainers in your community, and start that wonderful journey grooming your dog to the best he can be.