"Nested" Labels Search in GMail

After I complained about not being able to drill-down to find the intersection of multiple Google Labels, the bright idea appeared in my mind that there might be a way to "hack" it. Indeed, you can do it in GMail.

Click on a label heading and the Search Mail search box will show label:<label>.

To find the intersection of multiple labels, search for:

label:<label1> label:<label2> ... label:<labelN>

For example, if I want to find messages labeled both dance and pictures, type into the search box:

label:dance label:pictures

Label names with multiple words are separated by hyphens, such as:

label:Danse-Libre

Well, Blogger has a different user interface for searching for labels, and I haven't yet figured out a way to hack Blogger URLs to do the same if possible. The blog search box doesn't take the label keyword.