How to find Real circuit diagrams used by computer industry consisting of NAND Gates or NOR Gate
For some functions, data sheets show underlying logic. For example a 74HC74 flip flop data sheet shows this:

In this case, four basic functions (five if you count the hysteresis input) are used: NAND, NOR, Transmission gate, inverter. Be aware that different logic families take advantage of their logic peculiarities to simplify or to improve speed of their functional operation - an emitter-coupled logic (ECL) flip flop looks nothing like this. Data sheets might show underlying logic of the simpler functions like synchronous counters, encoders/decoders, adders. Beyond an arithmetic logic unit (ALU) like a 74181, the logic breakdown becomes complex enough that diagrams like this convey little useful information. But they might be useful to show the progression from simple-to-complex.
As others have noted, old logic data books often had chapters introducing 'new' logic families to designers who needed upgrading to the improved technology - before web publishing. Lots of extra details on how to use chips in 'new' designs.