COVID-19 Named Entity Recognition for Vietnamese Thinh Hung Truong author Mai Hoang Dao author Dat Quoc Nguyen author 2021-06 text Proceedings of the 2021 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Kristina Toutanova editor Anna Rumshisky editor Luke Zettlemoyer editor Dilek Hakkani-Tur editor Iz Beltagy editor Steven Bethard editor Ryan Cotterell editor Tanmoy Chakraborty editor Yichao Zhou editor Association for Computational Linguistics Online conference publication truong-etal-2021-covid 10.18653/v1/2021.naacl-main.173 https://aclanthology.org/2021.naacl-main.173/ 2021-06 2146 2153