Getting new branches from remote repo.

Hello list,

I have a trouble I don't know how to solve. When I am cloning remote
repo I automatically get all it's branches stored at my repo (they are
listed at .git/remotes/origin). When someone adds new branch(es) to
remote repo git pull (git fetch) does not automatically add them to my
repo. I have a tool to list all remote branches (git ls-remote --heads
origin) but I can't find how to add interesting (or all) branches to
by repo.

By the way, how can I clone remote repo created by cloning another
repo using git clone --use-separate-remotes ? Even git ls-remote
--heads origin does not show all branches taken from that another
repo.