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The IPv4 and IPv6 tab shows you all conversations between two hosts/IPv4/IPv6 addresses, regardless of the used protocols or how many sessions they have been established during the capture.
The TCP tab shows you each single TCP session between two IP hosts. That could be one, two or more sessions per host pair.
The conversation with 8.8.8.8 is probably DNS traffic, which uses (mostly) UDP instead of TCP. You will find it in the UDP tab.
To answer your question: to see all conversations use the IPv4 and IPv6 tab. Remember that conversations to multicast and broadcast addresses will also count as a conversation. If you need to find out the conversations between hosts only, you've to filter them out.
