Go to solvnet.synopsys.com , lot about DC is there ,
any way u can refer "Advanced ASIC chip Synthesis " by Himanshu Bhatnagar,
lot is present .
book is present in EDA foroum ,
If your DC is properly installed in your workstation , You can click "sold" , document will pop up. OR you go to the directory you installed DC, there should be a directory called sold, Docs from synopsys including DC PT et. are there. Good Luck!