Then why is it that you get just as good, if not better, search results when you type words in decreasing order of information content and omit common words, so

Then why is it that you get just as good, if not better, search results when you type words in decreasing order of information content and omit common words, some of which are essential for parsing natural languages? E.g. Beatles walrus -> the song "I am the walrus" by the Beatles. Tintern vacuum -> the song "Vacuum cleaner" by Tintern Abbey.