I am looking to save a user's search keyword, including the refiners that the user selected - they will just click on a particular button (SAVE SEARCH). this should be retrievable in order for the user to click on it again when he is in the Search Page.

I've seen some solutions but it only saves the search terms/keywords that is entered in the search textbox but this wont save the selected ref

You can just save the URL from the last search. It includes the full query, including refiners. Your users could just save a browser favorite/bookmark. You could write some JavaScript to save the URL to a list and then a little more JavaScript to display the list in a dropdown.

I think there is blog article with a solution for this somewhere on the web.