use strict;
use warnings;

my %hash = (1711 => {BUS => 'Plumbing', CAT => 'Plumbing'});
my @str = ('Elite Plumbing', 'Wonderfull Welding');

for my $key (keys %hash) {
    my @matches = grep {-1 < index $_, $hash{$key}{BUS}} @str;
    
    next unless @matches;
    print "Match for $hash{$key}{BUS} in:\n   ";
    print join "\n   ", @matches;
}
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Prints:

Match for Plumbing in:
   Elite Plumbing
[download]