using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var words = new[] {"abcde","iertaz","aio","zzeml","amoioze"};

        var search = new[] {'a','e','i','z'};

        foreach (string match in words.ContainsAll(search))

        {

            Console.WriteLine(match);

        }

    }

}

​

public static class Ext

{

    public static IEnumerable<IEnumerable<T>> ContainsAll<T>(

                                                this IEnumerable<IEnumerable<T>> source,

                                                IEnumerable<T> search,

                                                IEqualityComparer<T> comparer = default)

    {

        ArgumentNullException.ThrowIfNull(source);

        ArgumentNullException.ThrowIfNull(search);

        comparer ??= EqualityComparer<T>.Default;

        var searchSet = new HashSet<T>(search, comparer);

        return source.Where(item => searchSet.IsSubsetOf(item));

    }

}