How can you correctly filter content on a children's Android tablet?

Question

Android

Hello!
A child surfs the Internet, it happens that Google gives out unwanted content for certain queries, especially pictures are "difficult" in issuing.
Is there a way (program) to significantly reduce the risks of unwanted results for a child from search engines, in particular Google?
Disable access altogether, do not give a tablet, etc. Do not offer. You need a normal content filter and a search engine results filter.
Thanks for the constructive ideas!

Answer 1

Specify specific DNS servers in the connection properties on the tablet itself, and not "receive automatically", for example:
https://dns.yandex.ru/advanced/

Yandex.DNS is a free recursive DNS service. Yandex.DNS servers are located in Russia, CIS countries and Western Europe. User requests are processed by the nearest data center, which ensures a high connection speed.
...
The speed of Yandex.DNS in all three modes is the same. The "Basic" mode does not provide any traffic filtering. The "Safe" mode provides protection against infected and fraudulent sites. "Family" mode includes protection from dangerous sites and blocking sites for adults.
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Block adult sites
Yandex algorithms are able to detect erotic and pornographic content in indexed pages. It analyzes both the text and pictures in the document, as well as other factors - for example, the reference environment. Data about sites with such pages is updated 2-3 times a week.
In Yandex.DNS Family mode, erotic and pornographic ads are blocked on all sites. The host of such an ad network is prevented from obtaining the correct IP address, so the ads and banners themselves cannot be loaded.