It's a certainty that translations of tankas are not as readily available to readers as are haiku translations. The wonders of Japanese poetry are grounded in mystery. Shadowy images and metaphors. Never absolute directness of explicitness. Both the haiku and tanka show this.
Japanese poetry suggests rather than states.
This is a notion we should consider. Where the English language teaches us to be direct, Japanese language is more ambiguous. This has to do with the complicated use of syllables in their language. Their syllables proffer double-meanings in a radical way. Each line is a phrase or sentence fragment calling great attention to itself.