What's wrong the Blogger search???

It's not the first time this happens to me, and it's starting to get on my nerves. Many of the things I write in my blog are mostly done for my own personal benefit - easily retrieval of data from anywhere I am.
Today I wanted to find my recipe for my lentil soup. I have it on paper somewhere, but not at my fingertips. So I opened my blog and did a blogsearch for "soup" inside my blog. Sounds reasonable, doesn't it? Well, my recipe was nowhere to be found, even when I tried other searches ("lentil", "rich", "Soup" with capital S, etc.).
The funny thing in all that is that when I do a simple search on Google, I get my recipe immediately.