ปัญหา Error Query SELECT <?=$_GET["txtKeyword"];?> ข้อมูลที่เป็นภาษาไทย ไม่ได้ครับ

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Error Query [SELECT * FROM position WHERE idposition= 'ก' ]

<?php
include("menu.php");
$host="localhost";

$username="root";

$password="root";

$db="police_mamber";

$tb="position";
$position=$_GET[position];
$idposition=$_GET[idposition];
$connect= mysql_connect( $host,$username,$password) or die ("ติดต่อกับฐานข้อมูล Mysql ไม่ได้ ");
mysql_select_db($db) or die("เลือกฐานข้อมูลไม่ได้ "); 




//////////////เอา code มาจาก phpmyadmin
$strSQL = "SELECT * FROM  position  WHERE position  LIKE CONVERT(_utf8 '".$_GET["position"]." '
USING tis620 )  ";
echo $strSQL;
echo $position;





$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
$objResult = mysql_fetch_array($objQuery);



mysql_db_query($dbname,"SET NAMES tis620"); 
mysql_query("SET character_set_database ='tis620'"); 
mysql_query("SET character_set_results ='tis620'"); 
mysql_query("SET character_set_client ='tis620'"); 
mysql_query("SET character_set_connection ='tis620'"); 
mysql_query("SET character_set_system ='tis620'"); 
mysql_query("collation_connection = tis620_thai_ci"); 
mysql_query("collation_database = tis620_thai_ci"); 
mysql_query("collation_server = tis620_thai_ci"); 




$sql="SELECT position.idposition ,position.position  ,position.id
FROM position




///////////////รับค่าจากตัวแปรที่เป็นภาษาไทย
WHERE position.position ='$position';

";
$db_query=mysql_db_query($db,$sql);
$result = mysql_fetch_array($db_query);



$id=$result["id"];
$name=$result["name"];
$lastname=$result["lastname"];
$rank=$result["rank"];

$idposition=$result["idposition"];
$position=$result["position"];
$division_name=$result["division_name"];
$ampur=$result["ampur"];
$station_name=$result["station_name"];
$positiondivition_name=$result["positiondivition_name"];
$positionlevel_name=$result["positionlevel_name"];




?>