Import omni.physx in vscode

when I used omni.isaac.contact_sensor, and I opened the source code in vscode, the other package imported can be detected, but omni.physx and omni can’t. I tried copy the omni.physx to the folder isaac_sim-2021.2.1 and expand the routine in setting.json in the folder .vscode, it failed to detect the package. what should I do to debug in vscode?