State-owned firms took off in Vietnam with the rise of its post-war Communist government in the 1980s. They develop oil and gas. They provide phone service and run an airline. Some make dairy products or garments. They make up about one third of the country’s $186 billion economy. And in the understated terms of people you talk to in Vietnam, those firms don’t always make money. The economic frontier nation of 89 million people needs something else.