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Tropes are surprisingly hard to search for. “That thing where someone does X...” Only trick I can think of is listing several examples in a search and hoping someone’s named the set. But it’s a coarse hack. Need like a behavioral regex language or something.
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Is a google search with site:tvtropes\.org helpful? You could also search for known examples and see what tropes are listed on their pages in hope of finding it. (Infohazard warning: timesink)
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Naming convention might help some? Trope names are often only clever / amusing / meaningful in reverse (when you already know what the trope is)
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