LinkedIn terrible job posts

I am currently looking for android developer job and have been trying to use LinkedIn to find it but it is very painful process. I keep seeing jobs that aren't even related to the search title. I search android developer job and then see a bunch of web developer jobs in the result. Why does LinkedIn allow this?

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official