sub canonize { return join '', sort split //, lc $_[0]; }

my $jumble = 'OLHOSC';

open(my $fh, '<', $dict_file)
   or die("Unable to open dictionary file \"$dict_file\": $!\n");

my $found = 0;
$jumble = canonize($jumble);
while (<$fh>) {
   chomp;
   if (canonize($_) eq $jumble) {
      print("$_\n");
      $found = 1;
      last;
   }
}

if (!$found) {
   print("No matches found.\n");
}