PackagesNotFoundError CUDA 11.8.0

I am trying to install CUDAtoolkit 11.8.0 in my anaconda virtual environment.
First, I search compatible cudatoolkit using conda search cuda, and it showed a list as below:
Screenshot 2024-03-22 094633

And I then use conda install cudatoolkit=11.8.0 to install cuda package, but it still showed
PackagesNotFoundError: The following packages are not available from current channels: -11.8.0

I’ve also checked the first channel, it does have the package I want to install.
I don’t really know what I should do here, if anyone has any suggestion, that would be great!
Thank you!