JavaScript - buscar datos con un formulario tomando datos de un json

$(document).ready(function(){

	$('#buscarnuevo').click(function(event){

		event.preventDefault();

		$.ajax({

		    url:'php/buscarDatos.php',

		    type:'GET',

		    contentType: 'json',

		    success: function(data) {

			    data.pruebas.forEach(function(val){

			        console.log('-------------- DATOS --------------------');

				    console.log(val.id, val.nombre, val.apellido, val.email, val.telefono);

				});

	        }

		})

    });

});

header('Content-Type: application/json;charset=utf-8');

echo json_encode($rows, 128);

// Esta linea no es necesaria, ya que quieres retornar un json no html

//print("<pre>".$mysql_json."</pre>");

$(document).ready(function(){

	$('#buscarnuevo').click(function(event){

		event.preventDefault();

		$.ajax({

		    url:'php/buscarDatos.php',

		    type:'GET',

		    contentType: 'json',

		    success: function(data) {

			    data.pruebas.forEach(function(val){

					$('.table > tbody').append("<tr><td>"+val.id+"</td><td>"+val.shipdate+"</td><td>"+val.po+"</td><td>"+val.partDesc+"</td><td>"+val.invoice+"</td><td>"+val.trackID+"</td><td>"+val.carrier+"</td><td>"+val.countryto+"</td><td>"+val.transmitted+"</td><td>"+val.partType+"</td><td>"+val.scanlistDate+"</td><td>"+val.assetID+"</td><td>"+val.unitserial+"</td></tr>");

				    console.log(val.id, val.shipdate, val.po, val.partDesc, val.invoice, val.trackID, val.carrier, val.countryto, val.transmitted, val.partType, val.scanlistDate, val.assetID, val.unitserial );

				});

	        }

		})

    });

});

<?php

require 'conexion.php';

header('Content-Type: application/json;charset=utf-8');

$conexion=conexion();

        $po=$_GET['po'];

        $shipdate=$_GET['ship'];

        $scanlistDate=$_GET['scan'];

        $partDesc=$_GET['part'];

        $assetID=$_GET['asset'];

        $unitserial=$_GET['unit'];

        $trackID=$_GET['track'];

        $shipAddress=$_GET['address'];

        $transmitted=$_GET['kf'];

        $countryto=$_GET['ef'];

        $carrier=$_GET['lp'];

        $partType=$_GET['af'];

mysqli_set_charset($conexion, "utf8");

$sql= "SELECT id,po,so,shipdate,scanlistDate,part,partDesc,partType,qty,unitPrice, totalPrice,caseNum,dimepeso,coo,invoice,carrier,trackID,manway,shipto,countryto,          mot,shipAddress,shipTime,scanlistime,seal,scanlist,transmitted,servicelevel,sapinvoice,          userID,assetID,unitserial,eco,eta,arrival,est,reprogram,uncreate,delivery,signed,pod,isorder,

          dco,accidente,realDelivery,factura,invoiceSumari,fecha,costo,comentarios from t_persona where	po  like '%$po%'

					and shipdate  like '%$shipdate%'

					and scanlistDate like '%$scanlistDate%'

					and part like '%$partDesc%'

					and partType like '%$partType%'

					and carrier like '%$carrier%'

					and trackID like '%$trackID%'

					and countryto like '%$countryto%'

					and shipAddress like '%$shipAddress%'

					and transmitted like '%$transmitted%'

					and assetID like '%$assetID%'

					and unitserial like '%$unitserial%'";

$result=mysqli_query($conexion,$sql);

echo json_encode($result, 128);