What are some trees that are good for the environment?

Question

And they have to be able to grow in vietnam

Answer 1

You need to define what you mean by "good for the environment".  Do you want it to filter specific pollutants?  Provide habitat for animals?  Prevent erosion?

What species you use depends on the specific location (not country, but soil type, water content, light intensity) and your purpose.

Answer 2

the tree must provide food to a lot of organisms.

shud give shade.

shudnt be an invasive species which wont allow local species to grow.fig and banyan are good options