Long-term memory is last stage in the multi-store model memory, and it refers to the knowledge what learners have really understood and mastered in their mind (Ranganath, Cohen & Brozinsky, 2005). Although it is permanent and how to help learners to recall what they have learned from the long-term memory is essential. Schwering and MacDonald (2020) discovers that recall some information from the long-term memory needs to rely on the appropriate clue.