Kind of off-topic, but recently there was a front-page post here on Vietnamese-Americans' dominance of the nail salon industry, which is what I think of when I think of the manicure business, too. Though come to think of it, in New York, I rarely saw any Vietnamese-owned salons:
It helps to have the 3rd highest concentration of Koreans in the U.S. and a large Vietnamese population in Northern Virginia. Go down one street and there's nothing but Vietnamese nail and hair businesses. Go down another and you'll find Koreans.
http://www.bbc.com/news/magazine-32544343