After one of the most brutal drawdowns in recent market history, a concentrated bet suggests this turnaround story isn’t finished yet.New Oriental Education & Technology Group (EDU +0.56%) saw a significant purchase from Singapore-based Serenity Capital Management, which increased its position by approximately $21.6 million, according to a November 13 SEC filing.What HappenedAccording to a Securities and Exchange Commission (SEC) filing dated November 13, Singapore-based Serenity Capital Management increase ...