ขอคำชี้แนะในการทำระบบค้นหาข้อมูลแบบข้ามปีพ.ศ. ครับ

mysql_select_db($database_dbseminar, $dbseminar);
if($select3 <> "0"){
if($select <> "0"){
$showselect3 = " and teacher_form.year_id like '%$select3%'";}
else{
$showselect3 = " and teacher_form.year_id like '%$select3%'";}
} else{
$showselect3 = "";}
$query_teacher_form = "SELECT * FROM teacher_form INNER JOIN teacher_seminar  ON (teacher_form.teacher_id = teacher_seminar.teacher_id)    INNER JOIN years       ON (teacher_form.year_id = years.year_id)       INNER JOIN agency       ON (teacher_form.agency_id = agency.agency_id)        INNER JOIN positions       ON (teacher_form.positions_id = positions.positions_id)     INNER JOIN type    ON (teacher_form.type_id = type.type_id)  INNER JOIN mouths    ON (teacher_form.mouth_id = mouths.mouths_id) INNER JOIN days    ON (teacher_form.form_day = days.days_id) INNER JOIN course    ON (teacher_form.form_course = course.course_id)  WHERE  teacher_form.mouth_id BETWEEN '".$_POST['select']."' AND '".$_POST['select2']."' ".$showselect3." ORDER BY teacher_seminar.teacher_id ASC ";
$query_limit_teacher_form = sprintf("%s LIMIT %d, %d", $query_teacher_form, $startRow_teacher_form, $maxRows_teacher_form);
$teacher_form = mysql_query($query_limit_teacher_form, $dbseminar) or die(mysql_error());
$row_teacher_form = mysql_fetch_assoc($teacher_form);