apple banana find news that contain at least one of the two words.
"some words" find news that contain the exact phrase "some words".
apple* find news that contain words such as "apple", "apples", "applesauce", or "applet".
+apple +juice find news that contain both words.
+apple -macintosh find news that contain the word "apple" but not "macintosh".
+apple macintosh find news that contain "apple", but rank news higher if they also contain "macintosh".