3 ways to stay warm there are keep warm when you go outside, keep your house warm enough, and don't drink and eat cold foods.
Second way to stay warm that is keep your house warm enough. Turn on your heat at the degree that you feel warm. Use the rubber strip to tight the base of your doors and windows, so that the cold air can't blow through. Also use your fireplace but you have to make sure that the flue closed, because the cold air can blow from the chimney.
Third way to stay warm that is don't drink and eat cold food. If you drink and eat cold food, you will get more cold. You have to drink hot tea, hot coffee, hot chocolate...and eat hot foods like Pho, noodle, soup or hot pot...these things can make your body feel warm and get better when you feel sick and cold.
