I solved my specific case by creating a super tag.
Tag A contains album set 1
Tag B contains album set 2
create Tag C
add Tag A to Tag C
add Tag B to Tag C
In the Tag view Tag C shows two items, Tag A and Tag B.
But when I select Tag C in the album focus view I will see the album set 1 AND album set 2
and because Tag C contains Tag A and Tag B it is automatically updated when the contents of Tag A and/or Tag B changes.
Solves my problem.