+
A leading plus sign indicates that this word must be present in each article that is returned.
-
A leading minus sign indicates that this word must not be present in any of the articles that are returned.
(no operator)
By default (when neither + nor - is specified) the word is optional, but the articles that contain it are rated higher.
*
The asterisk serves as the truncation (or wildcard) operator. Unlike the other operators, it should be
appended to the word to be affected. Words match if they begin with the word preceding the * operator.
"
A phrase that is enclosed within double quote characters matches only articles that contain the phrase literally, as it was typed.
apple banana
Find articles that contain at least one of the two words.
+apple +juice
Find articles that contain both words.
+apple tree
Find articles that contain the word apple, but rank articles higher if they also contain tree.
+apple -tree
Find articles that contain the word apple but not tree.
apple*
Find articles that contain words such as apple, apples, applesauce, or applet.
"sweet apple"
Find articles that contain the exact phrase sweet apple (for example, articles that contain my sweet apple but not my sweet and tasty apple).