Multiple reference filter

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Hi guys,

I have a real estate website and I’ve done a filter which sorts the properties by type, genre and zone. I used the code from below. But I have a new database for the zones and now I have the zone field from my properties database as a multiple reference. How can I sort the properties by the zones with a fieldkey from zone database

 $w("#dataset5").setFilter(wixData.filter()
     .contains("inchiriereVanzare", $w('#tipvanzare').value)
     .contains("zona", $w('#zona').value)
     .contains("tip", $w('#tippropietate').value))

.then((results) => 
      {
         console.log("Dataset is now Filtered");
          $w("#repeater1").data = results.items;
     })
  .catch((err) => {
   console.log(err);
  });      

 $w("#repeater1").expand();