"Hast du besondere s9y eventplugins installiert?"
This leads to https://www.google.de/search?q=%22Hast+du+besondere+s9y+even..., which so far has only one search result, to http://sw-guide.de/2006-11/serendipity-plugins-seitenleisten.... Which by the way does not contain the target sentence, but that might be because the search moved over into non-verbatim mode.
If I search without the quotes I get more results, but I think not the target thread.
Admittedly, this is not "" not working by showing pages that do not contain the target keyword. But it is "" failing by the search not properly searching its own index.
What's going on there? Why is the index of a rather stale 20 year old forum not complete? The site is indexed in general.
Thread after thread of hundreds of people telling you your wrong and then you going "actually the community is wrong". Month after month, year after year, you pull this crap.
Admit it, Google search is worse now than it was before, and partly because they are abjectly failing at handling quotes.
what the ... ? Why do you delete stuff from your index? Even if it's down there's a good chance it'll be archived ...