If you'd like to let your users know how many search terms there has been on a search then .
Go to the View you are using for the search page .
administration > Structure > Views
> go to the display you are on ie 'page'
> in the middle panel find 'HEADER'
> click add
> find 'Global: Results summary'
> this will be pre filled with 'Displaying @start - @end of @total' which you can change and add extra tokens if you need.