TCAN1042HV: how to read can transceiver in more then 8 byte

I am using the CAN(TCAN1042HVDQ1 ) controller of Tiva(TM4C1231E)  series processor along with TI CAN transceiver to read the CAN messages from vehicle ECU. CAN message send and receive is working perfect. I use the CAN driver(library) of the TIVA series. For each parameter\data a request is sent through CAN transmit and the corresponding output data comes in CAN receive frame(Interrupts). The  CAN receive frame is of maximum 8 bytes length most of the time. However there are CAN frames more than 8 byte length and I am not able to read it properly. Just want to know how to read the CAN frames of more than 8 byte length.