chương trình con là?

https://www.google.com/search?q=ch%C6%B0%C6%A1ng+tr%C3%ACnh+con+l%C3%A0%3F&sourceid=chrome&ie=UTF-8#:~:text=m%E1%BB%99t%20%C4%91o%E1%BA%A1n%20ch%C6%B0%C6%A1ng%20tr%C3%ACnh%20%C4%91%C6%B0%E1%BB%A3c%20%C4%91%C3%B3ng%20g%C3%B3i%20th%C3%A0nh%20m%E1%BB%99t%20%C4%91%C6%A1n%20v%E1%BB%8B%20tr%C3%ACnh%2C%20n%C3%B3%20th%E1%BB%B1c%20hi%E1%BB%87n%20m%E1%BB%99t%20s%E1%BB%91%20t%C3%A1c%20v%E1%BB%A5%20c%E1%BB%A5%20th%E1%BB%83%20m%C3%A0%20ch%C6%B0%C6%A1ng%20tr%C3%ACnh%20c%E1%BA%A7n%20th%E1%BB%B1c%20hi%E1%BB%87n%20nhi%E1%BB%81u%20l%E1%BA%A7n%20t%E1%BB%AB%20nhi%E1%BB%81u%20n%C6%A1i%20trong%20th%E1%BB%9Di%20gian%20ch%E1%BA%A1y%20c%E1%BB%A7a%20n%C3%B3.