Dec 14 Taiwan's Advanced Semiconductor Engineering Inc said on Monday it will increase its stake in rival Siliconware Precision Industries Co Ltd to make it a wholly owned unit in a bid to deflect a Chinese rival's plan to buy into the company. ASE's plan, approved by its board, comes after Siliconware Precision, also known as SPIL, said on Friday that China's state-backed technology conglomerate Tsinghua Unigroup will take a quarter stake in the company at T$55 a share.