Why is there no reference to the concept of bodily resurrection in the Torah? (I mean the 5 books attributed to Moses.) Any ideas?
Because it hadn't been clearly revealed yet. It is only mysteriously alluded to in some Prophets (Ezekiel's vision of the dried bones, for instance) and becomes a tenet of (some strands of) Judaism only late in the Second Temple period (in apocalyptic writings such as the book of Daniel 12:13 - "But you, go your way, and rest; you shall rise for your reward at the end of the days"). This is why the Sadducees (who adhered to the Torah alone) were at odds with the Pharisees (who received the Prophets and the other books of the OT as canonical).
Our Lord refuted the Sadducees by quoting Torah, though: "You are wrong, because you know neither the Scriptures nor the power of God (to resurrect the dead). For in the resurrection they neither marry nor are given in marriage, but are like angels in heaven. And as for the resurrection of the dead, have you not read what was said to you by God, I am the God of Abraham, the God of Isaac, and the God of Jacob
? He is God not of the dead, but of the living." (Matthew 22:29-32)