you need to complete Valencia II main quest
and go back to SAND GRAIN BAZAAR talk with Barhan Nesser for take quest Suspicious Aakman
do quest until quest : To the Ancient Ator you will got knowledge
ps.you can get Alten and Kalten knowledge from quest : A True Unknown Danger to the Desert when you do Suspicious Aakman full quest
If you completed the quest https://bdocodex.com/tw/quest/5554/8/?sl=1 and got a shitty grade don't worry! You can delete the knowledge and take it back from Atosa at Aakman node : https://bdocodex.com/tw/npc/50626/1/ it may allow you to get a better grade. Keep in mind that it cost 50 energy to get the knowledge + 10 energy to delete it!