เขียน report excel แล้วภาษาไทยไม่แสดงทำไงค่ะ ช่วยหน่อยค่ะ

	$sql='SELECT [No_],[Name],[Account Type],[Debit_Credit]  ';
	$sql.=',[Blocked],[Direct Posting],[Reconciliation Account]  ';
	$sql.=',[Gen_ Posting Type] ,[Gen_ Bus_ Posting Group],[Gen_ Prod_ Posting Group]  ';
	$sql.=',[VAT Bus_ Posting Group],[VAT Prod_ Posting Group]  ';
	$sql.=',[WHT Business Posting Group],[WHT Product Posting Group] ';
	$sql.='FROM  [TAE2012].[dbo].[Inventory Monitor$G_L Account] ';
	if($datepicker!=''){$sql.="WHERE [Last Date Modified] Between '$day1' and '$day2' ";}		
	

	//print $sql;
	
	$stmt = sqlsrv_query( $conn, $sql);
	
   // $row2=sqlsrv_num_rows($stmt);	
	
	$a=2;
	while( $row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC) ){
	// Miscellaneous glyphs, UTF-8

	$objPHPExcel->setActiveSheetIndex(0)

    ->setCellValue('A'.$a,$row['No_'])
	->setCellValue('B'.$a,$row['Name'])
	->setCellValue('C'.$a,$row['Account Type'])
	->setCellValue('D'.$a,$row['Debit_Credit'])
	->setCellValue('E'.$a,$row['Blocked'])
	->setCellValue('F'.$a,$row['Direct Posting'])
	->setCellValue('G'.$a,$row['Reconciliation Account'])
	->setCellValue('H'.$a,$row['Gen_ Posting Type'])
	->setCellValue('I'.$a,$row['Gen_ Bus_ Posting Group'])
	->setCellValue('J'.$a,$row['Gen_ Prod_ Posting Group'])
	->setCellValue('K'.$a,$row['VAT Bus_ Posting Group'])
	->setCellValue('L'.$a,$row['VAT Prod_ Posting Group'])
	->setCellValue('M'.$a,$row['WHT Business Posting Group'])
	->setCellValue('N'.$a,$row['WHT Product Posting Group']);
    
	$a=$a+1;			
	}

// Rename worksheet
$objPHPExcel->getActiveSheet()->setTitle('Simple');