Use parentheses to encapsulate OR statements for the search engine to
execute them properly.
The OR operator is executed as "I would like at least one of these terms".
Groupings of terms are made using ( and ). Groupings of all query elements are supported in general. Groupings are also supported after a field - field group.
The query elements in field groups all apply to the same field and cannot include a field.
(big OR large) AND banana title:((big OR large) AND banana)