The search box seems recently to have caused some confusion - Google have somehow altered how the results appear.
If you put in a search term and a result is found, a box will appear with the text
"Showing posts sorted by relevance for query x ..."
Scroll down through the blog posts that appear below the notification box. Some of them will appear in their entirety but the longer ones will have a Page Break. Your result may be behind that break. Click on
"Read more"
at the bottom of the post so that you can find your result!