Some bodybuilders and athletes use trenbolone esters for their muscle-building and otherwise performance-enhancing effects.  Such use is illegal in the United States and many other countries. The DEA classifies trenbolone and its esters as Schedule III controlled substances under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia .  The infamous "duchess" cocktail administered to Russian athletes at the Sochi Winter Olympics consisted of oxandrolone , a metenolone ester, and a trenbolone ester. 
Choose one from the list to represent yourself, and one to represent the person you are talking to, depending on sex and relative age. For example, to get the attention of a waiter or waitress in a restaurant, say em/anh/chi oi (oi being the ubiquitous Vietnamese term for "hey"). If you listen closely, when people address you or talk about you in Vietnamese, they will be using these terms. They will be very impressed if you can master this! Nonetheless, even between natural Vietnamese people, it can get awkward when you try to figure out how to address someone who appears to be the same sex and, as far as you can tell, about the same age as you. Once you figure out their age and sex, they may have you use one of the above terms, or simply be amiable and ask you to call them "Ban", or "friend".