Is there a way to search for video tutorials at MacMost.com and Club MacMost (Patreon.com) at the same time?

Use the search field at the top of MacMost.com.

The search field at the top of MacMost.com will search for videos at both MacMost.com, Patreon.com, forum answers and other content. So if you need to find something MacMost published, that search box at the top of this page is a good place to do it.