Call to undefined method Illuminate\Database\Query\Builder::title()

I am trying to implement a search so that user can input a book's title and laravel will browse the database and display results that match any character.

My 'book' table contains a 'title' field.

However if I input for example 'f' I get:

Call to undefined method Illuminate\Database\Query\Builder::title()

Search blade:

@extends('layouts.master')

@section('title')

@section('content')
    <h1>Search for books</h1>
    <form action="" method="POST">
    
        <div>
            <input type='text'  name='book' placeholder='Enter any character' />
        </div>
    <input type="submit" name="submitBtn" value="Search">
    </form>
@endsection

Details = Result page:

@extends('layouts.master')

@section('title')

@section('content')
    <h1>User Details</h1>
      <form>
      <p>
    <ul>
      @foreach ($books as $book)
    <a href=  "">
      </a>
      </p>
</form>
@endforeach
    </ul>
@endsection

Controller:

    function search()
    {
        $books = Book::all();
        return view('layouts/search',['books' => $books]);
    }
        function details() {
            $searchTerms = explode(' ', \Request::input('book'));
            $books = Book::whereHas('title', function($query) use($searchTerms) {
                if(!empty($searchTerms)){
                for

each($searchTerms as $book) {
               $query->where('book', 'LIKE', '%'. $book .'%');
            }          
         }
         })->first();
            return view('layouts/details', compact('book'));
}

via Przemek