在包含许多记录的大型表中进行搜索/查询

I've created a html+php page wherein it searches in a mysql database. I am able to get output when my table contains a few records but when my table has over 100+ records it would no longer show records when i search and shows my else statement which is "0 records".

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);

// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

if(!empty($sfname) || !empty($sgen) || !empty($sdoc) || !empty($smisc) || !empty($ssick) || !empty($sothers) ){

        $genQueryPart = !empty($sgen) ? "Gender LIKE '%$sgen%'" : "";
        $fnameQueryPart = !empty($sfname) ? "FullName LIKE '%$sfname%'" : "";
        $docQueryPart = !empty($sdoc) ? "Doctor LIKE '%$sdoc%'" : "";
        $miscQueryPart = !empty($smisc) ? "Misc LIKE '%$smisc%'" : "";
        $sickQueryPart = !empty($ssick) ? "Sickness LIKE '%$ssick%'" : "";
        $othersQueryPart = !empty($sothers) ? "Others LIKE '%$sothers%'" : "";

        $arr = array($genQueryPart, $fnameQueryPart,$docQueryPart,$miscQueryPart,$sickQueryPart,$othersQueryPart);

        $sql = "select * from index where ";

        $needsAnd = false;
    for ($i = 0; $i < count($arr); $i++) {
        if ($arr[$i] != "") {
            if ($needsAnd) {
                $sql .= " AND ";
            }

            $needsAnd = true;
            $sql .= " " . $arr[$i];
        }

    }

//Get query on the database
    $result = mysqli_query($conn, $sql);
    mysqli_store_result();
    //Check results
    if (mysqli_num_rows($result) > 0)
    {
    //Headers
      echo "<table border='1' style='width:100%'>";
    echo "<tr>";
         echo "<th>File ID</th>"; 
    echo "<th>Full Name</th>";
    echo "<th>Gender</th>";
    echo "<th>Doctor</th>";
    echo "<th>Misc</th>";
    echo "<th>Sickness</th>";
    echo "<th>Others</th>";
    echo "</tr>";

  //output data of each row
      while($row = mysqli_fetch_assoc($result))
        {
        echo "<tr>";
                  echo "<td>".$row['FileID']."</td>";
                  echo "<td>".$row['FullName']."</td>";
                  echo "<td>".$row['Gender']."</td>";
                  echo "<td>".$row['Doctor']."</td>";
                  echo "<td>".$row['Misc']."</td>";
            echo "<td>".$row['Sickness']."</td>";
            echo "<td>".$row['Others']."</td>";
                echo "</tr>";

        }
              echo "</table>";
    }
 else {
        echo "0 results";
    }

} else {
    echo "You must enter at least one value";
}

mysqli_close($conn);

?>

Use if condition and paging to show more than 100 records after search. count the number of results after that use paging query to show records per page .This will be good idea for displaying large number of records. Don't Merge Php and Html together . fetch the record in a function and use is to integrate in HTML