It has to be in separate tries. That group of commands end with "boot" which will try to boot using the files loaded previously. So you can't try all of them at once.

Also, the vmlinuz and initrd.img files need to be paired, they need to have the same version number. For example, if you use vmlinuz-3.2.0-31-generic you have to use initrd.img-3.2.0-31-generic also. You don't need to try the newest one, you can also use the oldest, with smallest number. Is it like 3.2.0-20 or something like that.