Mì xao mem, as opposed to mi xao don (crispy egg noodles) is the Vietnamese version of Chinese chow mein. This dish appears in almost every Vietnamese fast food joint.
Living in the Bay Area, we’re lucky enough that Asian markets carry a wide variety of fresh egg noodles. I always look for the thin kinds. If you can’t find any, you could always boil angel hair pasta. The flavor will be slightly different but still delicious