Did you see https://moodle.org/mod/forum/discuss.php?d=410012#p1654462 ?
N.B. There is an Advanced search facility on moodle.org: https://moodle.org/mod/forum/search.php?id=5.
N.B. There is an Advanced search facility on moodle.org: https://moodle.org/mod/forum/search.php?id=5.