Studying human anatomy is a bit like enumerating and describing the different parts of a building. But this building is not empty, and there are various kinds of occupants. We harbour spiritual entities, of course, but also animals: reptiles, ...
word1 word2: search on at least one of the two words. +word1 +word2: search on both words. "word1 word2": search on the expression between" ". word*: searches on the beginning of the word, whatever the end of the word. -word: the word behind - is excluded from the search.