Term Pages

I've created a vocab and some hierarchical terms:

The vocab is A, terms are B being the parent of C and D.

A
- B
-- C
-- D

I've created content associated to C

When I go to myhost.com/a/b this content does not show up
When I go to myhost.com/a/b/c it does show up.

Is there a way to get it to show up under B, or at least have B show links to C & D? In general, how do I customize these pages? In some cases I only want them to show immediate children, in others it is pertinent for them to show distant children.

Thanks!