Use an asterisk within quotes to specify unknown or variable words

Here is a lesser known trick: searching a phrase in quotes with an asterisk replacing a keyword will search all variations of that phrase, where asterisk acts as a wildcard. For example, it can be helpful if you are trying to determine a song from its lyrics, but you can't make out or recall the entire phrase (e.g. "imagine all the * living for today"), or if you're trying to find all forms of an expression (e.g. "* is thicker than water").