This option returns only those results that contain at least one occurrence of the exact string of
words you typed in the exact order you entered them. Note that Search automatically filters out common
words like “a,” “and,” “the,” “these,” and so forth (for complete list see
reserved (noise) words). Search is not case sensitive
(for example, search for either "ethical" or "ETHICAL" will return "ethical" and "Ethical"
and "ETHICAL") nor is it affected by punctuation in exact phrase searches. You do not need to add quotes.