There are several things to consider when partnering with Vietnamese companies:
Legal and regulatory issues: Make sure that you understand the local laws and regulations and that your contracts are in compliance. It's also a good idea to work with a reputable local law firm.
Communication and cultural differences: Make sure that you have clear and consistent communication with your partner, as language and cultural barriers can sometimes be an issue. Be aware of cultural differences and try to be sensitive to them.
Business practices: Research your potential partner's business practices and reputation to ensure that they are reputable and trustworthy.
Intellectual property protection: Protect your intellectual property by securing appropriate patents, trademarks, and copyrights. Make sure that your contracts include provisions for protecting your intellectual property.
Managing expectations: Set clear expectations and establish a plan for achieving them. Make sure that both parties understand their roles and responsibilities, and have a process in place for resolving any disputes that may arise.
Overall, the key is to do your research, establish clear communication and expectations, and work with a reputable and trustworthy partner.