ELSA, the tech company that teaches English through speech recognition and machine learning, has raised $23 million in a Series C fund. ELSA  ELSA – English Language Speech Assistant – is an engaging app to help users improve their English pronunciation. It started when Vu Van, CEO and co-founder of ELSA, left Vietnam to pursue an MBA and Master’s in Education at Stanford University. According to ELSA’s website, Vu was confident in her English vocabulary but knew she had a strong Vietnamese accent.  Her professors and classmates could not always