สอบถามปัญหาเรื่อง MYSQL ในการ SELECT ข้อมูลออกมาโดยมีเงื่อนไข

<tr>
        <td>อาจารย์ที่ปรึกษา</td>
        <td>
        <input type="text" name="txt_TeacherA" id="txt_TeacherA" /></td>
      </tr>
      <tr>
        <td>กรรมการ</td>
        <td>
        <input type="text" name="txt_TeacherC" id="txt_TeacherC" /></td>
      </tr>

$sql = "SELECT DISTINCT thesis.Thesis_ID,thesis.Thesis_name,thesis.Thesis_year
				
						FROM (thesis INNER JOIN student ON thesis.Thesis_ID = student.Thesis_ID) 
						
						INNER JOIN department 
						
						ON (thesis.Department_ID = department.Department_ID) 
						
						INNER JOIN (thesis_teacher, teacher) 
						
						ON (thesis_teacher.Thesis_ID = thesis.Thesis_ID 
						
						AND thesis_teacher.Teacher_ID = teacher.Teacher_ID)
						
					    WHERE thesis.Thesis_ID LIKE '%".$strSearch_ThesisID."%' 
				
						AND thesis.Thesis_name LIKE '%".$strSearch_ThesisName."%' 
						
						AND thesis.Thesis_year LIKE '%".$strSearch_Year."%' 
						
						AND student.Student_ID LIKE '%".$strSearch_StudentID."%'
						
						AND student.Student_name LIKE '%".$strSearch_StudentName."%' 
						
						AND department.Department_ID LIKE '%".$strSearch_Department."%'
						
						AND teacher.Teacher_name LIKE '%".$strSearch_TeacherAd."%' AND TeacherType = 'A'
						
						AND teacher.Teacher_name LIKE '%".$strSearch_TeacherComm."%' AND TeacherType = 'C'
						
						AND thesis.Abstact LIKE '%".$strSearch_Abstract."%'
						
						AND thesis.Thesis_word LIKE '%".$strSearch_Word."%'	 ";
			
			
				$query = mysqli_query($conn,$sql)or die ( $sql . "<br>" . mysqli_error($conn) );