+ as operators within
conditions in the syntax
FILTER(range, condition1, [condition2, ...]) (AND between conditions is implied).
Thus, in your example you could use (I assumed you meant AND precedence over OR; other options can be easily handled)
The use I have provided is the most versatile, as it allows for an arbitrary nesting and precedence of AND/OR operations.
In the "standard" syntax use there is no option for OR operations.
A "standard" syntax use
FILTER(range, condition1, [condition2, ...])
can be replaced by