Helio da Silva Assis (born 26 January 1981) is a Brazilian former footballer who played for Vietnamese side Song Lam Nghe An FC, helping the club win the league. He mainly operated as a central midfielder who "recover[ed] the ball relatively well", though his "ability to launch attacks" was "weak".
He is a naturalized Vietnamese citizen, taking the name Nguyễn Hoàng Helio.
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