There are four Vedas, Rig,Yajur, Sama and Atharva .
In addition to this, we have Upavedas,Vedangas,Parisista, not to speak of the Smritis.
Of this lot this is what has been collected.
"The complete corpus of Vedic mantras as collected in Bloomfield's Vedic Concordance (1907) consists of some 89,000 padas (metrical feet), of which 72,000 occur in the four Samhitas"
This is only for the Samhitas.
Brahmanas,Aranyakas,Upanishads remain.
