“AND†is the simplest to use that returns results having both the keywords. For instance if you type in “consultant AND analyst†it would give results that contain both the words “consultant†and “analystâ€ÂÂ.
Next in line is “OR†that gives a more expanded search result, including one or more of the stated words.  For instance the search phrase “hairdresser OR stylist OR beautician†will return results having any of the words.
