I have dozens of purchased DVDs and recently got a Samsung Galaxy Tab 10.1, wanna transfer those DVDs directly to my tablet, is there any program can do that?

No such software can do that at least I know. Mostly portable tablet is not as well equipped as a desktop while the DVD conversion requires well CPU performance. But you can use a transcoding software to convert to tablet suitable format, then transfer to your tablet, very convenient and easy operated, I have completed that by using Pavtube DVD Ripper.
http://www.blu-ray-dvd-converter.com/dvd_ripper/