The top-level document is Compaq TCP/IP Services for OpenVMS Concepts and Planning. It points to the other ten (or more) that are available.
For DECnet, the top-level document is DECnet-Plus for OpenVMS Introduction and User's Guide. It references nine additional documents.
LANCP and LATCP are documented in OpenVMSSystem Management Utilities Reference Manual: A-L.
Networking in more general terms is discussed in Chapters 23 through 26 of the Open VMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.