Improvement of word alignment models for Vietnamese-to-English translation Takahiro Nomura author Hajime Tsukada author Tomoyoshi Akiba author 2015-dec 3-4 text Proceedings of the 12th International Workshop on Spoken Language Translation: Evaluation Campaign Marcello Federico editor Sebastian Stüker editor Jan Niehues editor Da Nang, Vietnam conference publication nomura-etal-2015-improvement https://aclanthology.org/2015.iwslt-evaluation.18/ 2015-dec 3-4 112 116