Unable to call parameterized constructor for type arguments in Generic class.

I’ve tried to define a generic class, that uses a type argument  derive from the specified base class without parameterless constructor.
The sample code is the following:

    public class KeywordsSearchTestGeneric<T> where T : Keywords//’,new()


    {


        // Methods


        public void ExactMatchCases()


        {


            T keywords1 = new T(“string”);


        }


    }


    public class Keywords


    {


        // Methods


        public Keywords()


        {


            throw new  NotSupportedException();


        }


        public Keywords(string connString)


        {


            Debug.WriteLine(“Keywords “ + connString);


        }


    }


    public class DerivedKeywords : Keywords


    {


        // Methods


        public DerivedKeywords(string connString):base(connString)


        {


            Debug.WriteLine(“DerivedKeywords “ + connString);


 


        }


    }


 However it causes Compiler Error CS0304 “Cannot create an instance of the variable type ‘type’ because it does not have the new() constraint“.
I beleive that the error is irrelevant, because new Constraint (C#) specifies that any type argument in a generic class declaration must have a public parameterless constructor, but my class has a constructor with parameters.
However I’ve added new Constraint to the generic class declaration

    public class KeywordsSearchTestGeneric<T> where T : Keywords,new()

but it gives me another Compiler Error CS0417.
The description of the error includes suggestion :
If you need to call another constructor, consider using a class type constraint or interface constraint. “.
Unfortunately, i’ve started with class type constraint , but didn’t find a solution.