Black to Play, and exchange correctly

As Black, I was presented with this position, after the Knight has captured a pawn on d4.

Instinctively, I felt there was a correct combination here, that would give an advantage to Black.

What would you play ?

My game continued [33...Nxd4 32. Rxc8 Ne2+ ?  33. Kh1 Rxc8 34. Bxe5 Re8 ? 35. Rd5 ?? Nf4 ] which won, but was a bad combination.