Improving Web Search Relevance with Semantic Features Yumao Lu author Fuchun Peng author Gilad Mishne author Xing Wei author Benoit Dumoulin author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication lu-etal-2009-improving https://aclanthology.org/D09-1068/ 2009-08 648 657