Can you please check the sentence? Because "санаа авангаа" doesn't make sense in this sentence. The basic form of авангаа is aвах. Usually -нгаа (-нгээ, -нгоо, -нгөө) mean that some actions are happening at the same time.　In Japanese is would be ～ながら Утсаар ярингаа цонхоор харах. Алхангаа хөгжим сонсох.