current search spec too complex error

Hello All,

I am running a web service were I am comparing values from a csv to those already in CRM.  When the csv is a small file(less than 50 records), everything is fine.  If the file is larger I get the "current search spec too complex" error.  I see that the error is related to the "OR" operator and there is a workaround when comparing 2 expressions.

(Expression A) OR (Expression can be converted to the equivalence: NOT (NOT (Expression A) AND NOT (Expression )

But I have 100s of expressions.  Will someone please show me an example of the syntax that can be used when comparing more than 2 expressions?