using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<string> data = new List<string> { "hello", "what", "do", "doing", "does", "boing", "she" };

​

            List<string> subStrings = new List<string> { "he", "ing" };

​

            var result = data.Where(x => subStrings.Any(z => x.Contains(z))).ToList();

​

            foreach (var item in result)

            {

                Console.WriteLine(item);

            }

    }

}