Although the Venn diagram helps to organize your thoughts, it does not address the issue of "how much?" It's still possible to retrieve too many useful items; even worse, you may retrieve too few.
For too much
For too litle
In fact, it's wise to begin a search by ignoring the dates, languages, etc. until you know what's available. If the important work is in Japanese, you may have to find translations or pick another topic.