Check this

fetching-data.php

<?php foreach ($result as $row) {
                                    $value1 = strpos($row['c_main_title'], $searchValue) !== FALSE;
                                    $value2  = strpos($row['c_main_body'], $searchValue) !== FALSE;
                                    $value3 = strpos($row['cmt_dept_title'], $searchValue) !== FALSE;
                                    $value4 = strpos($row['cmt_dept_body'], $searchValue) !== FALSE;
                                    $value5 = strpos($row['aidt_dept_title'], $searchValue) !== FALSE;
                                    $value6 = strpos($row['aidt_dept_body'], $searchValue) !== FALSE;
                                    $value7 = strpos($row['food_dept_title'], $searchValue) !== FALSE;
                                    $value8 = strpos($row['food_dept_body'], $searchValue) !== FALSE;
                                    $value9 = strpos($row['rac_dept_title'], $searchValue) !== FALSE;
                                    $value10 = strpos($row['rac_dept_body'], $searchValue) !== FALSE;
                                    $value11 = strpos($row['p_message_title'], $searchValue) !== FALSE;
                                    $value12 = strpos($row['p_message_body'], $searchValue) !== FALSE;
                                    $value13 = strpos($row['vp_message_title'], $searchValue) !== FALSE;
                                    $value14 = strpos($row['vp_message_body'], $searchValue) !== FALSE;
                                    $value15 = strpos($row['about_college_title'], $searchValue) !== FALSE;
                                    $value16 = strpos($row['about_college_body'], $searchValue) !== FALSE;
                                    $value17 = strpos($row['mission_message'], $searchValue) !== FALSE;
                                    $value18 = strpos($row['vision_message'], $searchValue) !== FALSE;
                                    
                                    if ( $value1 || $value2) {
                                        echo "<h2 class='all-header'>".$row['c_main_title']."</h2>";
                                        echo "<p class='department'>".$row['c_main_body']."</p>";

                                    }

                                    elseif ($value3 || $value4){
                                        
                                        echo "<h2 class='all-header'>".$row['cmt_dept_title']."</h2>";
                                        echo "<p class='department'>".$row['cmt_dept_body']."</p>";
                                    }
                                    elseif ( $value5 || $value6){

                                        echo "<h2 class='all-header'>".$row['cmt_dept_title']."</h2>";
                                        echo "<p class='department'>".$row['cmt_dept_body']."</p>";
                                    }
                                    elseif ( $value7 || $value8){

                                        echo "<h2 class='all-header'>".$row['food_dept_title']."</h2>";
                                        echo "<p class='department'>".$row['food_dept_body']."</p>";
                                    }
                                    elseif ( $value9 || $value10){

                                        echo "<h2 class='all-header'>".$row['rac_dept_title']."</h2>";
                                        echo "<p class='department'>".$row['rac_dept_body']."</p>";
                                    }
                                    elseif ( $value11 || $value12){

                                        echo "<h2 class='all-header'>".$row['p_message_title']."</h2>";
                                        echo "<p class='department'>".$row['p_message_body']."</p>";
                                    }
                                    elseif ( $value13 || $value14){

                                        echo "<h2 class='all-header'>".$row['vp_message_title']."</h2>";
                                        echo "<p class='department'>".$row['vp_message_body']."</p>";
                                    }
                                    elseif ( $value15 || $value16){

                                        echo "<h2 class='all-header'>".$row['about_college_title']."</h2>";
                                        echo "<p class='department'>".$row['about_college_body']."</p>";
                                    }
                                    elseif ( $value17 || $value18){

                                        echo "<h2 class='all-header'>".$row['mission_message']."</h2>";
                                        echo "<p class='department'>".$row['vision_message']."</p>";
                                    }
                                    else { echo "<h2 class='not-found'>Your search result did not match</h2>";}
                                  }
                                  
                                  // and my all data are static on fields so i think i don't need to use loop for this. please tell me the efficient way for PDO db connection. ?>