I have a 95 accord and when I'm drivin to the left in a curve the car starts shaking, but this doesn't happen when I drive to the right.
I went to car repair and they check the stearing rack and replace the internal terminals (I don't know the correct name) of the stearing rack,
they check also the tie rods and balanced and said that everything is ok.

then I checked and still the same, I went to a junkyard and bought a stearing rack and replaced and helps a little bit but still happened the same, not as bad as it was before.

Can anyone help me on this please?

Some possible reasons could be:

A wheel with a distorted center

A worn strut that can't control wheel hop without the full weight on that corner

A worn bushing or ball joint in the lower suspension that allows the camber to wander when the weight transfers.

Front subframe/engine cradle mounts loose or broken.

Steering rack to body mount bushings worn.

Bent stub axle (rear)

First thing to do would be to rotate the tires and see if that has any effect, if you didn't already.

Does it occur at pretty much any speed in a curve, or does it get worse with speed?

IT occurs while driving at any speed in a curve, an yes is getting worst with speed.
Also looks like the car is jumping while driving when the street has some bumps or holes, or in turf the car shakes a lot.

Just a shot in the dark, but it really sounds like you have a strut that is no longer providing any damping or rebound control...

Look close for signs of oil leakage on the cartridges...