The book The Lonely Planet Guidebook on Vietnam explains: “The cave derives its Vietnamese name from the third of the chambers, which is said to have been used during the 13th century to store the sharp bamboo stakes which [Vietnamese military hero] Tran Hung Dao planted in the bed of the Bach Dang River ” to foil the invading Kublai Khan.
Grāmatā The Lonely Planet Guidebook on Vietnam paskaidrots: ” Alas vjetnamiešu nosaukuma izcelsme ir saistīta ar trešo telpu, kurā, kā vēstī nostāsts, 13. gadsimtā tikuši glabāti asie bambusa mieti, ko [vjetnamiešu varonis] Čan Hing Dao sasprauda Bahdangas upes gultnē ”, lai aizkavētu hana Hubilaja uzbrukumu.