If i try to mix elements on the research table they doesn't do anything. What can i do?? (i'm italian and my english is bad)
Only certain elements can be combined together, Aspects (Thaumcraft 4) - Official Feed The Beast Wiki is a list and how to create them, some of the ones mentioned are outside mod based.
You've made this thread in the Direwolf20 for minecraft 1.10 section, which does not have Thaumcraft last I checked. If you're playing Direwolf20 for minecraft 1.7.10, then you need to log into the server through the direct IP (direwolf.mym.li) If you enter the server through the lobby/hub (the big marble gateways) then Thaumcraft doesn't properly see that you've logged in