I've noticed for awhile this site's searches are case-sensitive which is unintuitive. For example, this morning I wanted to find a post in the NPD forum that had the word "Today" in the title. I typed "today" and no result. I had to back-arrow, and try "Today."
This can be changed by changing the collating sequence of a couple tables. You'd probably use phpmyadmin to change the posts and topics tables to "COLLATE utf8_unicode_ci;" (the "cs" changes to 'ci" for case insensitivity. See, for example, this phpbb support post.).
I think it's a big limitation because it's difficult to urge people to search for a previous thread when you have to say "be sure to try different case." I tend to use Google's advanced search, but that's a pain to describe how to reach it (and, it doesn't have the by-author feature).