haha yes, I misread your question, my bad.
Although I suppose I still don’t understand your question. You want to know whether there are any nostr AND based search engines? Not that I know of. You want me to give an example of an AND based search that I’d actually like to run? How about a search I just ran on Google: “LMDB” + “neo4j” + “ETL pipeline”. Of course, nostr is too young and devoid of content to give anything useful for that search, but hopefully one day that won’t be the case.
How about if I want content authored by Alice AND containing some specific keyword.