ช่วยด้วยครับ ทำ search ข้อมูลในฐานข้อมูลไม่ได้ครับ

 <?
              	include ("connectDB.php");	
				
				$cond = "";					
				if($_POST["search"] != "")
				{		
					$cond = $cond . " 	AND  (ThName like '%" . $_POST["search"] . "%'
										OR  Level like '%" . $_POST["search"] . "%'
										OR  QuaName like '%" . $_POST["search"] . "%'
										OR  CategoryName like '%" . $_POST["search"] . "%'
										OR  PositionName like '%" . $_POST["search"] . "%'										
										OR  ProvinceId like '%" . $_POST["search"] . "%')
					";
				}
				if($_POST["CategoryId"] != "")
				{		
					$cond = $cond . " AND  CategoryId = " . $_POST["CategoryId"];
				}
				if($_POST["PositionId"] != "")
				{		
					$cond = $cond . " AND  PositionId = " . $_POST["PositionId"];
				}
				if($_POST["Level"] != "")
				{		
					$cond = $cond . " AND  Level = " . $_POST["Level"];
				}
				if($_POST["QuaId"] != "")
				{		
					$cond = $cond . " AND  a2.QuaId = " . $_POST["QuaId"];
				}
				if($_POST["StartSalary"] != "")
				{		
					$cond = $cond . " AND  StartSalary = " . $_POST["StartSalary"];
				}	
				if($_POST["EndSalary"] != "")
				{		
					$cond = $cond . " AND  EndSalary = " . $_POST["EndSalary"];
				}	
				if($_POST["ProvinceId"] != "")
				{		
					$cond = $cond . " AND  ProvinceId = " . $_POST["ProvinceId"];
				}
				if($_POST["DistinctId"] != "")
				{		
					$cond = $cond . " AND  DistinctId = " . $_POST["DistinctId"];
				}
				
				$sql = "SELECT * FROM announce a1, anneducation a2, qualification a3 , entrepreneur a4 , province a5 , category a6 , position a7 , distinct a8
						WHERE a1.AnnounceId = a2.AnnounceId
						AND a2.QuaId = a3.QuaId
						AND a1.EntreId = a4.EntreId
						AND a1.CategoryId = a6.CategoryId
						AND a1.PositionId = a7.PositionId
						AND a1.DistinctId = a8.DistinctId
						AND a1.ProvinceId = a5.ProvinceId $cond";
				$result = mysql_query($sql) or die ("Error Query [".$sql."]");
				$Num_Rows = mysql_num_rows($result);
				
				echo $sql;
				while($row = mysql_fetch_array($result))
					{
		 
				?>                      
		    <table width="700" align="center" bgcolor="#CCCCCC">
                    <tr><td width="100"><font color="#0033FF">บริษัท:</font></td><td><? echo $row['ThName']; ?></td>
                    <tr><td width="100"><font color="#0033FF">ตำแหน่งงาน :</font></td><td><? echo $row['PositionName']; ?></td>
                    	<td width="100"><font color="#0033FF">ประเภทงาน :</font></td><td><? echo $row['CategoryName']; ?></td><td rowspan="2" align="right"><a href="#"><img src="images/address_book.png"/></a></td>
                    </tr>				
                    <tr><td width="100"><font color="#0033FF">วันที่ลงประกาศ:</font></td><td><? echo $row['OpenAnn']; ?></td><td width="100"><font color="#0033FF">สิ้นสุดวันที่ :</font></td><td><font color="#FF0000"><? echo $row['CloseAnn']; ?></font></td></tr>
                                                        	
					</table>
              		
                    <hr width="700" />
					<? } ?>