Tet, in the Vietnamese language, symbolizes the very first morning of the New Year in Vietnam and is popularly known as the Vietnamese New Year and it's celebration lasts for about 7 days. In preparation, people start cleaning and decorating their homes days and weeks in advance so that they can get rid bad fortune and bad memories associated with the previous year. People all over Vietnam buy new clothes as well as new shoes and try their best to pay off their debts and even try to resolve the differences among the family members and friends. Vietnamese people are also very particular about what they do on New Year's Day since they believe that the events and actions performed on New Year's Day determines a person's luck and fortune for the rest of the year. New Year gifts are exchanged among family members and friends. The first day of the Vietnamese New Year is reserved for visits to all the closest friends, teachers and parents, while on the second day people visit their in-laws and other acquaintances who are not as close. The third day is observed as the day of visiting the family of the teacher and more distant relatives. The spirits return to heaven on the fourth day of the Vietnamese New Year and business in the Vietnamese household returns to normal.
The Vietnamese Zodiac is made up of: The Rat (2020 - 2021); The Buffalo (Jan 2009 - Feb 2010); The Tiger (15 Feb 2010 - 2 Feb 2011); The Cat (3 Feb 2011 - 22 Jan 2012); The Dragon (2012 - 2013); The Snake (2013 - 2014);\par The Horse (2014 - 2015); The Goat (2015 - 2016); The Monkey (2016 - 2017); The Rooster (2017 - 2018); The Dog (2018 - 2019) and The Pig (2019 - 2020).
Here's the whole story gathered from around the internet: Tet The Vietnamese New Year.