How Do I Create a Disjunction As a Saved Search?

Using Mojave on MacBook Pro, I’m trying to create a disjunction search. Specifically, I can create and save a search for File Contains ‘Guide’ and I can create and save a search for File Contains ‘Manual,’ but I want to create a search such as File Contains ‘Guide’ OR File Contains ‘Manual.’ If I hit the plus sign to add the second search, it seems it uses AND, and thus I don’t get any search results. (No one names their documentation the ‘Manual Guide,’ of course.) So, how do I create a search that finds this OR that at the same time? Thanks, as always.
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John Russell