Query Expression with Like operator

Hi,

I want to retrieve the Customer details based on a string which contains Customer FirstName.

For Example: if the string is "Hello Maria, How are you?" then i need to retrieve the Customer record which having FirstName as "Maria", if I try it from sql query then I can use Sql query as:

SELECT * FROM Customer WHERE "Hello Maria, How are you?" LIKE "%"+firstName+"%"

But as I am working on CRM 2011 plugin I will prefer to use query expression instead of above SQL Query.

Can anyone please tell me that how we can write the same Query in form of QueryExpression?

Thanks,

Shaleen