(Image: [[https://upload.wikimedia.org/wikipedia/commons/c/c0/Bronze_dagger_Dong_Son_Culture.JPG|https://upload.wikimedia.org/wikipedia/commons/c/c0/Bronze_dagger_Dong_Son_Culture.JPG]])They were mainly religious customs and  [[https://bangcacloai.com/lam-bang-cao-dang/|bangcacloai.com]] [[https://slashdot.org/index2.pl?fhfilter=tradition|tradition]].