Scirus is one of the most comprehensive and comprehensive search engines for scientific and technological documents on the Internet, which was developed by Elsevier.

3、/

Compared with Google, we can find some good things that Google can't search. It has a simple interface and powerful functions.

Big, fast, Yahoo and Netease all adopted its search technology. You can have a try.

6、

Google is a search engine at the same level. It was put forward by Amazon.com, and the results of the web page were partly based on Google.

So it is guaranteed to be at the same level as Google, and Amazon's search function and personalized function in books are added:

Mainly to record your search history. It's still in beta, but it feels very good after trial. I recommend it to everyone.

But unfortunately, there is no Chinese content in the current book search.

7、/

At present, Baidu Sinology can provide retrieval and reading of cultural classics from pre-Qin to late Qing Dynasty. The content involves classics, history,

Sub-departments and sub-departments.

8、 http://infomine.ucr.edu/

NFOMIN was established by university librarians such as University of California, Wake Forest University, California National University and Detroit Mercy University.

Academic search engine. It mainly provides online academic resources for university staff, students and researchers.