The caretaker of my apartment block has two kids, aged about 4 and 6.
Sometimes when I arrive home they are hanging out the front with the security guard.
I greet them with a hearty "Chào cháu", which is how I was taught to say "Hello Kids".
They smile and shout back loudly "Chào Chú", which means "Hello Uncle" or more literally, the younger brother of your father.
As I walk up the stairs to my apartment I can hear them echo my greeting to each other and laughing, enjoying the novelty of my accent. It makes me smile.