.vimrc - Ctrl key mapping

I’ve installed Vim for z/OS. So far everything works as expected, except for that the Ctrl key mapping in my .vimrc is not working.
for example, I have these key mappings in my .vimrc, and they are not working.

map <C-d> :NERDTreeToggle<CR>
map <C-j> <C-W>j
map <C-k> <C-W>k
map <C-h> <C-W>h
map <C-l> <C-W>l