Any guide for NPC merchant trades?

I am a new player in PoE
I just learnt than trading in NPC merchants an iron ring + gem >>>> Special ring.

Are there any other "combination" of items to get new items instead of orb´s pieces?
ty in advance
They are called vendor's recipes and here in this wiki page, you can see a complete list of them.

http://en.pathofexilewiki.com/wiki/Vendor_Recipes

Orbs can be traded for other more useful orbs, so do take note of them as well.
Thanks a lot for your fast reply :)

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