The data entered from user in the advanced search (_search.php) can be accessed in the search method in the corresponding model.
I need to access these data from another place (because I need to display them in some reports) other than the search method (from a model, a controller or whatever…)
So, If you want to use the results of search method for other purpose you have to create an action and write the appropriate code.
OR
if you want to use those result in the same controller/action (actionAdmin) you have to store the model->search() in another variable (in action) and use it both in controller and in view.