I don't know you reason for needing the search, but I've done something similar in my own games by pressing the snippet reveal button on individual knowledge results which the party have seen - but the main topic is not revealed to the players.
If you never intend to have your players use the player version, then you could use a similar method and include revealing the topic so that when you switch to "player mode" then you can see which snippets you've marked as revealed.
I have put forward a feature request to have some sort of "GM tick" against snippets for this sort of situation.
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