The git remote show <origin name>
command will list all branches (including un-tracked branches). Then you can find the remote branch name that you need to fetch.
Example:
$ git remote show origin
Use these steps to fetch remote branches:
git fetch <origin name> <remote branch name>:<local branch name>
git checkout <local branch name > (local branch name should the name that you given fetching)
Example:
$ git fetch origin test:test
$ git checkout test