the meaning of the new year

Doan Ngo Tet Festival: Origin, meaning and special dishes in Vietnam
every year on may 5 (lunar calendar), our people organize to celebrate the lunar new year. so, where does the lunar new year come from and what does it mean?
Thanh Minh and Vietnamese customs
details thanh minh is a time when most people come back to their roots and remember the deceased. so, what kind of customs do we have in vietnamese?