.NET API DialogExpression Complex Queries

Hi all,
I'm using the .NET API and I'm creating queries with dialogexpression and they run well. Now I'd like to mix logic operators (and, or) but I can't find a way to do it. To date I have only been able to join criteria using "and" operator. Does anyone know how these kinds of queries can be performed since the dialogexpression works in this way?

var query = new DialogExpression()
                {
                    Operation = DialogExpressionOperation.And,
                    Condition = searchCriterias,
                    Count = 100
                };

Thanks in advance

Hi Adriano,
there is no other way to do complex queries as combine and merge single dialog expressions.
Perhaps in the distant future you will be able to perform complex queries with the dialog expressions.

Best regards
Florian