Notary land purchase

I have seen a plot near hyderabad for purchase. The history of this plot is as below. Plot area is 400 Sq. Yards and registered to person X in 1988 through registered sale deed. Later it is been sold to person A and then to person B and then to person C. All these transactions that is X to A, A to B, B to C are went through Notary process and were not registered with SRO.These notary documents were validated by SRO and the property is sold to person D through registered sale deed. Right now the encumbrance of the plot shows only the last transaction. Can I go ahead and buy this property? Do I get all legal rights of this property if I buy this land from registered sale deed from person Do? Please suggest.