I'm looking to get a bow that with no enchanted effect.

I tried player.additem 000deed8 1, the top left of my screen showed it has been added in my inventory, but i cannot see it in there. Am I doing osmething wrong?

http://www.uesp.net/wiki/Skyrim:Karliah%27s_Bow

I cant find the bow in coc qasmoke either.

I'm not sure but I know that once I tired to console a nightingale bow at the start of a game before I even went to riften and it said it added a "Karliah's Bow" to my inventory but no items were added whatsoever. So I just did the theives guild 1st

isn't her bow just an ebony bow with an enchantment?

You can try entering

"help nightingale"

"help Karliah"

and see what ID numbers pop up.