cd x/y/z command does not work even if I see z with ls command when directory is x/y
Your data directory name ends with a space character, so the name is actually "data" (without the "" of course). Unless you really need it like that, it's probably best to rename it by running mv "data " data.

If you can't change the name, use cd "data ", or cd data?, or cd data\ to change into the directory.