I imported an e-mail and decided I wanted to annotate it and then tag both the e-mail and the note with Personal. When I do a search for personal only the e-mail turns up. However, the group tags turns up and if I click that and personal the docs appear. If I use the advanced search the docs appear.
The toolbar search will find the child group of Tags named “Personal” (or whatever), but not documents with that tag. Need a smartgroup or Tools > Search for that.