duratyayam—insurmountable SB 8.24.51
duratyayam—unsurpassable SB 4.12.8
duratyayam—impossible to overcome SB 4.27.3
duratyayam—very difficult SB 1.19.2
duratyayam—insurmountable. SB 4.2.27
Can't find any compound Sanskrit words containing duratyayam.