Complex Search guidance

[Rbrux]

I make extensive use of UR's advanced search facilities.

I continue to struggle however, with the operation of 'nested' searches (I think that's what they are called - I'm talking about searches that have the appearance of an outline).

Although I can usually structure a search that returns the results that I want and expect, it often involves much trial and error. Sometimes I just cannot understand why a particular search picks up (or fails to pick up) a particluar item.

Would it be possible for Kinook (whether by expanding the help manual or by a post to this forum) to provide some more detail about how nested searches work. A few example searches with notes comparing and explaining the particular results generated would greatly assist.