Search Function for Addons Problematic

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I've had a number of experiences where a reasonable seeming search term failed to find an add-on.

I've experienced this with both searching on the c5 site directly and searching in Browse Add-ons from the Dashboard of s site (without any filters being set).

Current example: I was looking for Simple PHP Block for a site and entered PHP and Simple PHP etc in the Dashboard Browse for Add-Ons and I do not bring up the desired add-on. But using the same search directly in the c5 Add-on site it comes right up.

Am I doing something wrong? Is the fact that this add-on does not appear in my site based search meaningful? The site is the most recent version of c5 and the add-on is supposed to work with 5.3+.

Thanks for any help.
Jason