The Vietnamese word for tree is
cây

Translations for tree and their definitions

cây	©
1. n. a plant with a hard trunk or stem, such as a woody tree or bamboo, as opposed to cỏ
2. n. (by extension) a plant (including trees and grasses), or more rarely, a mushroom
3. n. (colloquial) (short for, cây số, , kilometre/kimometer)
Nhà tui cách Sài Gòn cỡ năm chục cây. - My house is about fifty kilometres from Sài Gòn.
4. classifier. vi-cls, 核,荄,?
5. classifier. Indicates plants
6. classifier. Indicates stick/rod-like objects
7. classifier. (musical instrument) Indicates string instruments and some other types of musical instruments

Pronunciation