Cheers!
Though now I have a better theory- you're still Greek, but!
But ERT actually stands for Earth-received time (aparently, wikipedia says that it is "a measurement used when dealing with interplanetary spacecraft"). Why? Well, because you admitted that you want to visit Europa, and knowlede of said object is not obvious to many, and you want to visit it- so either you're a rocket scientist, or work for NASA (they have no reason not to employ Greeks), or, in any case, are highly interested in space travel. Thus, this is what you desire the most and made an acronym for it!
Oh, and you like Vietnamese cuisine! Which is obvious, since "xiem" is, apparently, a food ingerdient!
Or (actually "and" would be more appropriate), you're so cunning, that you put in a lot of information into your username, not only do you like space travel, you also told us what your job is: you're an Emergency Room Technician!
Now, you've admitted that you know the "sound" of Greek letters- and you can read them, given that you can "say" them- hence you lived in Greece, but have no knolwedge of the local language because you don't care about things that are closer than Europa!
Voila: you're a technician in a hospital in Greece, and you like Vietnamese food!