What is the meaning of 爲?

idu form of ᄒᆞ (“to do”, also a light verb deriving verbs and adjectives)

to do

a light verb attached to various non-verbs to derive verbs and adjectives.

to be at

chữ Hán form of vị (“ for the sake of”)

chữ Nôm form of vì (“because (by or for the cause that; on this account that; for the reason that)”)

chữ Nôm form of vay (“to borrow”)

Source: wiktionary.org