Method links does not exist

Im getting this error when i do like this. I want that my search is case insensitive. Any suggestion?

  $articles = Articles::whereHas('translations',function($query) use($search){
    $query->whereRaw('LOWER(`title`) like ?', array( $search))
    ->orWhereRaw('LOWER(`intro`) like ?', array( $search))
    ->orWhereRaw('LOWER(`content`) like ?', array( $search));
  })->get();

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