Multi Selection CheckBox

//SEARCH FUNCTION🚀
    function search() {

              $w("#dataset1").onReady(function () {
              
   /////SEARCH BAR AND DROPSOWN///////// No problem, able to run 
            $w("#dataset1").setFilter(wixData.filter().contains('itemPageText', String($w('#brands').value))
                    .and(wixData.filter().contains('materials', String($w('#materialstype').value)))
                    .and(wixData.filter().contains('title', String($w('#searchtittle').value)))
                    .and(wixData.filter().contains('reinforcements', String($w('#reinforcements').value)))
                    .and(wixData.filter().contains('printingProcess', String($w('#processingtechnology').value)))
                    .and(wixData.filter().contains('materialsForm', String($w('#deliverform').value)))
                    //.and(wixData.filter().contains("certifications", String($w('#certicate').value)))
                    
     /////MULTISELECTION BOX///////// unable to function when selection more than one               
                    .and(wixData.filter().contains('aviFor', String($w('#availablefor').value))) 
                    .and(wixData.filter().contains('polymer', String($w('#polymerfamily').value)))
                    .and(wixData.filter().contains('polymer', String($w('#polymerfamily2').value)))
                    .and(wixData.filter().contains('polymer', String($w('#polymerfamily3').value)))
                    .and(wixData.filter().contains('polymer', String($w('#polymerfamily4').value)))
                    .and(wixData.filter().contains('polymer', String($w('#elastomer').value)))
                    .and(wixData.filter().contains('polymer', String($w('#simulated').value)))
                    .and(wixData.filter().contains('polymer', String($w('#simulated2').value)))
                    .and(wixData.filter().contains('polymer', String($w('#metal').value)))
                    .and(wixData.filter().contains('polymer', String($w('#metal2').value))))
                    //.and(wixData.filter().ge("tensilestrength", Number($w('#tensileSTslider').value))))
                    //.and(wixData.filter().contains("colour_mfg", String($w('#colorfinishing').value))))
                
                .then(count)
        
 

Multi-selection Box
-Its no problem and the result able to shown when visitor just select one type of item in the selection box
-But when the visitor select more than one choice, the data shown no result found

Your multi-selection-checkbox works like expected, because you are using → AND ← that means all of the selected options must be → TRUE ←

If you need an → OR-function ← → you will have to use → hasSome() or hasAll().

Also connect your posts, if they are related to each other, so everyone has a better overwiew of your issue.

…but do not open several posts onto one and the same issue.