Are you mean the new page design without search feature on this tutorial page? https://www.construct.net/en/tutorials
You can use google, just type:
For Construct 2 Tutorial
site:www.construct.net/en/tutorials/construct-2 *Your Keyword here*
example
site:www.construct.net/en/tutorials/construct-2 platform tutorial
For Construct 3 Tutorial
site:www.construct.net/en/tutorials/construct-3 *Your Keyword here*
example
site:www.construct.net/en/tutorials/construct-3 platform tutorial