@ToNhi, I am also from Vietnam. I think you should not include "Le Vu Quy" sign for the interview. "Le Dinh Hon" is ok as dinh hon means engagement while "Vu Quy" usually for wedding. I also file for K1 and dont do any ceremony cuz i read many info on VJ here that the Consulate can misinterpret the engagement ceremony as a wedding. I also worry about the interview myself as the consulate in HCM is tough on K1. anyway, good luck on your interview.