Duh! I just found the answer to my question about searching a blog.
Blogger just added the navigation bar at the top of each blog. That search box is blog-centric searching. In other words, if you do a search in that box on a blog, you will search that entire blog only, not the entire Internet.
This is your Friday PSA.
Still no comment on why the blogger spellcheck doesn’t come pre-programmed to understand the word “blog” and “Google”.