There are questions why China didn't explore and discover Europe.
The answer is that the Ming dynasty prohibits that. So the issue is that China is so centralized they can't do that. One king says no, then that's it.
However, Asia is not just China.
We got the Vietnamese, Japanese, Indonesians (with many maritime powers) and so on and so on.
Not one of them have good ship technology to travel to Europe?
Are the Chinese the only one with decent ship technology? The Chinese are not even a maritime nation.
Another explanation is the incentive. However, if Europeans want to trade with Asians, why Asians don't want to trade with Europeans?