In the meantime as a workaround you can use the + (must include) or - (must not include) when using the Find Trades tool to filter out unwanted results.
Example: Go to search.php and type in Crescent Moon -Amulet to see only results for the Runeword Crescent Moon only (and not the amulet). This will work with the filters/advanced filters as well.
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Squelches this trader, making their offers on your trades invisible to anyone except themselves. Their trade listings will also be hidden from your marketplace.
Your squelch list can be managed and edited from Top right dropdown > Account Prefs > Squelches.
Find Crescent Moon Runeword but get also CM Amulet 
mockingbirdreal
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