Organizing Complex Data

This isn’t a problem, as much as a unique situation. I’m a novice at WordPress, and I’d be grateful for any help.

I run a website that provides translations of four varieties: Wordlists, names, phrasebooks, and poetry. These translations are into four different languages, and a total of 6 dialects between two of the languages. Not only that, but the wordlists, phrasebooks, and namelists have categories of their own. If I were to put it all together, this is the levels of categories that I need to effectively share these translations. I need to be able to link to every level of these categories without getting things from other categories, (like looking for Gondorian Sindarin greetings, but getting all of the greetings in all of the languages, not just the Gondorian Sindarin ones) and I haven’t found a way to do that yet.

poetry
–Language
—-dialect
wordlists
–Language
—-dialect
——Wordlist type
phrasebooks
–Language
—-dialect
——Chapter
namelists
–Language
—-dialect
——name-ee
——–theme
———-word-roots
————suffixes
————–name-types

The way that I thought I’d do it was to have tags on each entry. Many of these categories are redundant – for every single translation type, there is a “Sindarin” category. Every Sindarin category has the same available dialects. Each phrasebook in each language has the same chapters. But, I can’t link to more than one tag at a time, I discovered to my frustration.

Say that I want to link to a set of translations that fit into the following tags/categories:
Phrasebook, Sindarin language, Gondorian dialect, Greetings
How could I link to them? Is there a way to do this? Please help!

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