using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static List<string> PalabrasProhibidas = new List<string> { "document", "documents" };

    public static void Main()

    {

        var thedocumentswithblablabla = "the documents bla bla bla";

        var thedocumentdocuments = "document documents";

        var primercaso = thedocumentswithblablabla.Split(' ');

        var segundocaso = thedocumentdocuments.Split(' ');

        Console.WriteLine(primercaso.All(i => PalabrasProhibidas.Contains(i)));

        Console.WriteLine(segundocaso.All(i => PalabrasProhibidas.Contains(i)));

    }

}