OR operator

The OR Boolean operator is the default conjunction operator. If no Boolean operator appears between two terms, the OR operator is assumed, unless the query_default_operator index parameter is set to AND. In that case, you must specify the OR operator, or use two adjacent vertical bars (||) to represent the OR operator.

The following search predicates find documents that contain either the term UNIX or the term Windows:

bts_contains(column, ' UNIX Windows ')
bts_contains(column, ' UNIX OR Windows ')
bts_contains(column, ' UNIX || Windows ')