 However, there are few research studies on machine reading comprehension (MRC) in Vietnamese, the task of understanding a document or text , and answering questions related to it.
<clarity>  However, there are few research studies on machine reading comprehension (MRC) in Vietnamese, the task of understanding a document or text , and answering questions related to it.
 However, there are few research studies on machine reading comprehension (MRC) in Vietnamese, the task of understanding a text and answering questions related to it.