This is the 386th most frequent Vietnamese word.
xây
"Xây" in Vietnamese means "to build" or "to construct."
Here, "xây" is used in its literal meaning referring to the act of building or constructing.
Họ đang xây một ngôi nhà mới.
They are constructing a new house.
In this sentence, "xây" is part of the compound "xây dựng," which metaphorically means to develop or establish intangible concepts like relationships.
Chúng ta cần xây dựng mối quan hệ tốt đẹp.
We need to build a good relationship.
Here, "xây dựng" is similarly used metaphorically, indicating the act of creating or working towards an aspirational goal or vision.