The help section says...

Search

Searching for posts is straightforward. Simply enter the tags you want to search for, separated by spaces. For example, searching for original panties will return every post that has both the original tag AND the panties tag.

But, attempting...
yaoi crossdress tied-up

Gets you...
Nobody here but us chickens!
Check your blacklist. We now automatically omit terms from your search when you have any tag there.

So...
IS there a way to do it, so you ONLY get items with all of the listed tags?

What am I missing here?

Thanks.

I really, really blew it here.

My example had an item ("tied-up") that was NOT a tag, so of course it returned nothing.

"yaoi crossdress tied" worked just fine.

Problem turned out to be non-existent.

Sorry.