Securing a long-term visa

Hello everyone,


I'm Abisoye, hailing from Nigeria. Currently, I run a software company based in China.


I'm contemplating a move to Vietnam, with or without my company. However, I've stumbled upon discussions indicating that visa procedures might pose challenges for Nigerians in Vietnam, especially since Cambodia has ceased issuing visas for Nigerians.


Do any of you have insights on securing a long-term visa beyond the initial three-month tourist visa?


Additionally, I'm considering launching a Lego/robotics school in Vietnam. I understand that  moving to a new environment demands time and attention. I'd love to hear any suggestions or ideas on navigating visa concerns while simultaneously establishing a business in Vietnam.


Grateful for any insights you can offer.