“…In the literature, several approaches have been proposed and tested in diverse domains. The diverse domains are mass gathering (Doan et al , 2015; Kang et al , 2014), lonely planet (Kang et al , 2014), privacy policies (Audich et al , 2017), sport event (Jiang and Tan, 2010), medical (Li and Wu, 2006), Chinese (Qiu et al , 2017), security information management (Abulaish et al , 2011) and insurance product development (Gillani and Kő, 2016). However, most of these approaches have problems with low accuracy rates and poor performance, failing to extract a good set of key concepts from a large set of candidates with long phrases.…”