I noticed a few weeks ago when I was looking for a tutorial to share with someone that the search bar on my blog and every other "Google Blogger" is not functioning.
I had removed it, replaced it, changed it's name to no avail.
This morning, I did a bit more research and did confirm that it is not just on my site~it is Blogger wide.
Apparently, they are working on the issue but it's been a couple of months now.
I recommend that you do a regular Google search to find tutorials and topics.
I have also added a Most Popular Post option and that might help bring up tutorials and topics that you are interested in reading.
Hopefully they will fix it soon! I myself use it all the time when sharing information with students and collectors.
(and PS....a new baby boy is being "born" today!)
Have a great Wednesday!