spurious "search was too wide" messages in p.d.o.

Hello,

<https://packages.debian.org> sometimes displays the message

> Note: Your search was too wide so we will only display only the first
> about 100 matches. Please consider using a longer keyword or more
> keywords.

with no obvious reason.  For example, a few minutes ago I saw it when
searching for "oui" within filenames:
<https://packages.debian.org/search?suite=sid&arch=i386&mode=filename&searchon=contents&keywords=oui>.

The search engine found five results, but apparently thought that 5 > 100!

Regards,
T.