As an example of what I mean, suppose I want to find Zen Buddhist teachings on diet. How should I go about finding this? Googling anything as it pertains to Buddhism (especially Buddhism) gets a tonne of results from Americanized Yoga types, which is less than authentic teaching.
From my U.S. perspective... Try using the word "Dharma" in your search terms. Most large Zen centers have web sites that list recommended reading, and other resources. Focus on translations of, or by ordained Zen Roshis (cross reference American Zen Teachers Association). Ask a librarian.