Under table sidespin

When the ball is under the table like 20-30 centimetres i want to know how can i hit the ball with sidespin and when it touches the table ... just fly off the table.

Hi Dinu,

We call this the Wobbly shot.

You are basically doing a sidespin chop from below the table level.  Brush across the ball to generate the sidespin.  It becomes more difficult for your opponent because they can't see the contact because it is below the table level.