How to query multiple Data or fields from repository pattern

    This is books model
    -----------------------
    public class Book
    {
        [Key]
        public int Id { get; set; }
        [Required]
        [MaxLength(30)]
        public string Title { get; set; }
        public string Authers { get; set; }

        [Column("Year")]
        [Display(Name = "Publish Year")]
        public string publishYear { get; set; }

        [Column("Price")]
        [Display(Name = "Price")]
        public decimal BasePrice { get; set; }
    }

    Repository interface
    --------------------
    public interface IBookRepository : IDisposable
        {
            IEnumerable<Book> GetBooks();
            Book GetBookByID(int bookId);
            void InsertBook(Book book);
            void DeleteBook(int bookID);
            void UpdateBook(Book book);
            void Save();
    }


Book repository
--------------------
public class BookRepository : IBookRepository
    {
        private BookContext _context;

        public BookRepository(BookContext bookContext)
        {
            this._context = bookContext;
        }

        public IEnumerable<book> GetBooks()
        {
            return _context.Books.ToList();
        }

        public Book GetBookByID(int id)
        {
            return _context.Books.Find(id);
        }

        public void InsertBook(Book book)
        {
            _context.Books.Add(book);
        }

        public void DeleteBook(int bookID)
        {
            Book book = _context.Books.Find(bookID);
            _context.Books.Remove(book);
        }

        public void UpdateBook(Book book)
        {
            _context.Entry(book).State = EntityState.Modified;
        }

        public void Save()
        {
            _context.SaveChanges();
        }

        private bool disposed = false;

        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    _context.Dispose();
                }
            }
            this.disposed = true;
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
    }

code taken from https://www.codeproject.com/Articles/644605/CRUD-Operations-Using-the-Repository-Pattern-in-MV

one simple question :- Now tell me how to fetch those books whose title is "blah" and Author is "test"

please show me with a sample code.