This page explains the notation used for Boolean searching. You must use the 'advanced' or 'extended' search form and you must set 'match' to Boolean in the appropriate drop-down menu.
| & | Boolean AND | ⋀ | example: cats & dogs |
| | | Boolean OR | ⋁ | example: cats | dogs |
| ~ | Boolean NOT | example: animals & ~dogs (~dogs, by itself will give no results, ~ excludes results, there has to be a basic search to exclude from!) | |
| ( ) | normal grouping | example: (cats and dogs) or (horses and cows) |