On the days of late autumn and early winter, taking advantage of the sunny weather, a team of rangers and forestry experts carried many things into the remote forest of Sao La Nature Reserve (A Luoi District)… Not to investigate deforestation, not to set camera traps or to rescue animals, this time they embarked on a journey to seek native forest tree varieties from the natural forest in order to perform the mission of planting forest tree varieties and conserving rare genetic resources.