Dynamic filtering between two tables

You can create a measure like

Employee is visible = 
VAR CurrentCode = SELECTEDVALUE( User[Mã Bộ Phận (Ngẫu nhiên các Level)] )
VAR Result =
    SWITCH(
        SELECTEDVALUE( User[Cấp độ mã] ),
        "Level 2",
        IF( CurrentCode IN VALUES( Org[Level 2 Code] ), 1 ),
        "Level 3",
        IF( CurrentCode IN VALUES( Org[Level 3 Code] ), 1 ),
        "Level 4",
        IF( CurrentCode IN VALUES( Org[Level 4 Code] ), 1 )
    )
RETURN Result

and use this as a filter on the user slicer, set to show only when the value is 1.