predict if Vietnam can sustainably feed it's future population

Now, people often have a question that in the future if a growing population, food will be enough for all people? Because now people are slowly ascending, but then increase more food so we can freely eat comfortably and eat as much as you like. But in the future, if the population increases rapidly and so many people so the food will not be enough to accommodate for all people. So therefore people need to work more to earn more food. If Vietnam have a lot of people but they don't go to work, Vietnam will fasting.