my $string ="EICHENBAUMSCHULE";
my @query = qw(EIC BAUM UMS CHU LE);

my $matchline = '@' x length $string;

for $match(@query) {
    my $spacer = index $string, $match;
    $matchline |= (('@' x $spacer) . $match) if $spacer > -1;
}

print for sort { length($b) <=> length($a) } $matchline =~ /[^@]+/g;