Unfortunately, we are not allowed to access Google services such as Google Search, Google Books and Google Scholar like a private user, due to terms of use and copyright protection of the published authors and Google's terms of service. Currently, Google does not allow access to its API for use cases, where the search results are not shown directly, because that violates their business model and agreements with the publishing industry. We are regularly checking our options and will immediately provide coverage of Google content as soon as the regulations undertake the respective change.
For crawling web content, we use Microsoft Bing as backbone to enhance our available internet content in addition to our own web index, focusing on scientific and academic relevant sites.