Filtering library with query string

I'm trying to filter library items by tag using query strings and am hitting dead ends with all three methods I've found.

Method 1: FilterField1=Tags&FilterValue1=Supervisor&FilterField2=Tags&FilterValue2=Manual

     This works but returns everything that matches either tag, I need it to only return items with both tags. 

Method 2: FilterName=Tags&FilterMultiValue=Supervisor;Manual

     Returns the error Exception from HRESULT: 0x80131904

Method 3: Added a Query String (URL) Filter webpart and use the query string Tags=Manual&Tags=Employee

      This one ignores the second term completely. The advanced filter options get greyed out as soon I connect it to the library.

Any suggestions?