Purchase and install the Rosetta Stone software program onto your computer. Most computer software or office supply stores sell the Rosetta Stone Program, but you may have a difficult time finding the program in Vietnamese in these locations. The best option is to order the program online at the Rosetta Stone Web site (see References below.) Open the Users Manual, and follow the directions to install and set up the software on your computer.
Create a schedule to follow that will require you to practice the Rosetta Stone Vietnamese program for at least 30 minutes per day. Practicing diligently every day will help you become fluent, and will allow you to speak Vietnamese easily in conversation.
Make one day per week "Vietnamese Day." On this day, require that everyone in the house speak only Vietnamese. This can be a fun and challenging way to test your language skills and can help you practice speaking Vietnamese to others in a conversational way. Before long, you will be fluent in Vietnamese and will be able to speak easily to native Vietnamese people.