Well, take a look down at the character strategies thread. There's one for
the team of maids, as well as ones for
Hisui and
Kohaku individually.
There are also PishiWiki pages on
Hisui and
Kohaku by themselves, but nothing on team strategies. Some of the information may be out of date though. There are some combos listed on those pages.
I'd happily link to MeltyBread's own wiki, except we have hardly anything on there.
There are also some combo vids listed in
this thread, but not all of them are from verB, or even Act Cadenza. You can also try searching Youtube with these moonspeak characters to get better results compared to just searching their romanized names:
ヒスコハ for HisuKoha
翡翠 for Hisui
琥珀 for Kohaku