AND operator2012 2013
2014 matches documents that contain any of the three
terms.
+2012 +2013
+2014 matches only documents that contain all three terms.
2012 2013
-2014 matches documents that contain 2012 or 2013,
but only if they do not contain 2014.
sample*.
This means that you get different results than if you entered “sample”, +sample,
or *sample*.
