I and 8 others are doing an 11 day loop around Hanoi in December, and I have some questions on some of the language basics if I may. I have seen both Xin Chao and Chao as hello; Chao and Tam Biet as goodbye. Is Chao the generic Gudday (Aussie), or Sawasdee or Ciao (italian)? I also have been told that to address someone older or higher in status, I should use ong (Uncle) or ba (aunt). As my group are all in their late 50', early 60's, it is more likely that we will be addressing someone younger. Can we use anh (man) and chi (woman), or even em try (little brother) and em gai (little sister), and what do we use for kids, or is this way to complex and should we just leave it all alone as we are going to get it terribly wrong. I am only going to try about a dozen basic words, but would like to get these right. Thank you, Dean.