%A Hong Quan Nguyen %A Phuong Thai Nguyen %A Thanh Quyen Dang %A Van Hiep Nguyen %T Automatic Detection of Problematic Rules in Vietnamese Treebank %X Viet Treebank is an annotated corpus newly published in 2009. In this paper, we applied automated methods to detect errors in Viet Treebank based on the concept of equivalence classes proposed by Dickinson. On this basis, we propose an improved method of error detection by transforming the syntax tree based on vertical markovization. Our experimental results on Viet Treebank showed that the scope of error detection extended more than 2 times and improved the precision more than 18.07% in comparison with the base line methods. %C Hanoi %D 2016 %L SisLab1532