An Amulet of Talos will reduce the time between shouts by 20%. I believe this stacks with the +20% to shout recovery from shrines to Talos, which will knock a whopping 40% off your recovery time.
Sadly, you cannot disenchant the amulet and learn to make your own +Shout Recovery items.
Also the dragon mask Morokei (requires unofficial bugfix patch) adds another 20% getting you to 60%.
Expanding on my comment that there is no way to search for an item in the game*.
One answer is to use console commands to add the bow to a known merchant then manually buy back the bow from the merchant. You might want to do this with a merchant who is likely to have acquired the bow naturally though any merchant will do.
First you will need to find out what the FormID of the bow is. To do this you will need to load a previous save where you have the bow. Open the console and run:
ShowInventory
The bow will be listed with it's FormID being enclosed in brackets after the name.
1 - Item Name (FormID) (other stuff)
(I think you can also just drop the bow and left click on it?)
After you know the FormID load up your current save game and find the merchant you want to give the bow to. Open the console and left click the merchant, running:
AddItem FormID
Close the console and buy the item from the merchant as normal.
If you ever encounter the "real" bow then you should remove this from the game by selecting the merchant and running:
RemoveItem FormID
*The toolkit or a custom mod may add this, however they are not released as of this post.
Best Answer
These all seem like quest items, which can't be removed without console commands or by completing their related quest. That said, while they should be removed when you complete their related quests, I found myself stuck with some of these items after the quests were complete with no way to drop them as well.
Searching the UESP for the items may help you understand which quests these items belong to. For instance the Elder Scroll can be sold to the librarian at the College of Winterhold (Urag gro-Shub). The Gauldur Amulet Fragment and the Ivory Dragon Claw are part of the quest Forbidden Legend.
If this sounds like a lot of work, and you're willing to deal with your cluttered inventory, remember that quest items weigh nothing (despite their listed weight).