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supermarket, the closest is fivimart in syrena xuan dieu. Minimart dan's , but its very expensive and i would not recommand it.
Try the Advanced Search function under Top Spots. You can put a pin on a map and search from there.
Dan's shop is on Truc Bach.
I also know a Fivi Mart and Intimex between your home and work. City Mart in Hanoi Towers wouldn't be too far out of your way either.
Because you work in Hang Bai, why not enter the CitiMart in Hanoi Towers ? or Intimex near the HoanKiem lake after work.