If you are living outside Vietnam, congratulations! All the cons goes to you. You will receive five days in the year for sick leave, they just reimburse half of the half of your healthcare plan, and they do not care with your opinion.
But regardless of where you live, you'll work like a slave, working overtime almost every day and getting paid. Most of the promises they make to you during hiring will not be kept, and there's no use complaining, after all, who told you to agree to work with them?