Laravel Eloquent - not retrieving required rows

Making use of search box on the app, database have 2 tables like below:

 ________________
|**Services**
 ________________
|=>id
|=>name
|=>description
|=>other_columns
________________

and:

 ________________
|**Products**
 ________________
|=>id
|=>name
|=>description
|=>service_id
|=>other_columns
________________

=>each Service contains many Products

=>Due to the form of the search box:

user can search for a word for products and optionally choose a service, thus, the eloquent that I use to retrieve results for:

1. if user didn't choose a specific service to search in:

   $data = Product::where('name','like',"%$search_value%")
           ->orWhere('description','like',"%$search_value%")
           ->orWhere('description_long','like',"%$search_value%")
           ->paginate($items_per_page);
   
   

2. if user did choose a specific service:

   $data = Product::where([
               ['name','like',"%$search_value%"],
               ['service_id','=',"%$service%"],
           ])
           ->orWhere([
               ['description','like',"%$search_value%"],
               ['service_id','=',"%$service%"],
           ])
           ->orWhere([
               ['description_long','like',"%$search_value%"],
               ['service_id','=',"%$service%"],
           ])
           ->paginate($items_per_page);
   
   

Models relations are like below:

1. Product Model:

   public function service(){
       return $this->belongsTo(Service::class);
   }
   
   

2. Service Model:

   public function products(){
       return $this->hasMany(Product::class);
   }
   
   

In both cases $data always contain all rows of products. how to achieve the right result?

via Chebli Mohamed