I don't know if you are aware of it or not, but Google used to have specialised search. There were services such as google.com/linux and google.com/bsd and Google.com/unclesam.
There search services allo users to search within the specified area filtering out other results. If you search for office suites on google.com/linux, it will only show results for Linux.
The shutdown of these services came to notice on a Google Forum, where users were concerned about a redirect from the service to generic google.com/webhp.
It may be surprising for many users of the services as Google did not announce the discontinuation of the service; it just disappeared.
Since no one voiced any concern about google.com/linux and google.com/bsd given such users are quite informative and conscious it seems there were only a few takers of the service.
Goole said in a statement to seroundtable, "We are no longer offering specialized search services at google.com/linux, google.com/microsoft, google.com/bsd, google.com/mac, google.com/about and google.com/unclesam. These services were established many years ago to offer search across a limited index of the web, which in the past was a better way to find this information."