you can use this to force the search to do an exact search

exact search tick box

/* put this in the searchbox ekm tag */
<input type="checkbox" name="ticked" id="ticked" value="Bike"> tick it<br>


/* paste this in the footer */
<script type='text/javascript'>
$(document).ready(function()
{
    $("form").submit(function(e)
    {
       var txtbox  = document.getElementsByName("search")[0];  
       var tickbox = document.getElementById("ticked");

       AddQoutes(txtbox, tickbox);
    });
});

function AddQoutes(txtbox, tickbox)
{
  if (tickbox.checked == true)
  {
    if (txtbox.value.charAt(0) != "\"")
        txtbox.value = "\"" + txtbox.value
    if (txtbox.value.charAt(txtbox.value.length - 1) != "\"")
        txtbox .value += "\"";
  }
 
}
</script>