Administratively, Chua Chu Kang is used when referring to the group representation constituency (GRC) as well as the town council, but the MRT station and road names are spelt as Choa Chu Kang.
It’s also Choa Chu Kang library and not Chua Chu Kang library, but it is Chua Chu Kang Community Centre.
https://www.asiaone.com/singapore/singapores-grcs-it-chua-chu-kang-or-choa-chu-kang
It’s also Choa Chu Kang library and not Chua Chu Kang library, but it is Chua Chu Kang Community Centre.
https://www.asiaone.com/singapore/singapores-grcs-it-chua-chu-kang-or-choa-chu-kang