soft-404 errors
 

Google tools informed me an increase in soft-404 errors on my three main sites.
Looking at them they came from search queries looking like this

search/%E5%A4%A7%E5%A5%96HB%E8%80%81%E8%99%8E%E6%9C%BA%E5 %BC%80%E6%88%B7+Q82019309.com/

As the Q80...com site looks like a fucking bad one, I assume I should get rid of this search on my sites but don't know how to do.

Any idea to help is welcome.

interesting and bump for ideas

https://www.google.com/search?client...utf-8&oe=utf-8

Hacking spammers fail?

Yes, we are seeing them too. I think much of the reason they try is not to "hack" but to hurt you in the SE's. They suck dick.
Locate the urls and report to Google.

The problem is that I don't see which IP is generating such a bad search traffic.
So currently I've created a page listing all the search list of the soft-404 error but as each days there's new different search, there's no end.

I was thinking there was a tip with .htaccess so that Google doesn't consider them as 404 error as the result of the search page display a Wordpress page stating "no result".