The dream is showing how you are in the midst of people and with you being bitten is showing how these people maybe attacking you. Or they are harmful and will prey on you. With your relative showing you the fish's teeth is guidance to help you in understanding how dangerous these people can be. With the big house being in Vietnam can be relating to your past life, or people you have grown up with. With you being in the pond can be showing spiritual understanding and emotions you maybe feeling.