Is there a search engine over Artificial Intelligence and Machine Learning -related sites?

Sometimes it is necessary to dig into Artificial Intelligence or specifically Machine Learning problems to make a research. Common googling (in my own experience) usually doesn't help much due to a lot of non relevant or paid materials in SERP. Google Scholar at the contrast is limited to scientific publications only, sometimes it is too narrow.

I wonder, if there is a kind of dedicated search engine over AI & ML -related sites?

Thanks!