The number of hits can be limited using various filters. The filter function allows a rough classification (e.g. by pools or year) as well as the exact restriction to person names or keywords. A multiple selection of the filters is possible. The display below the filters is (except for year) sorted by the frequency in the hit list. Further information on the filters can be found directly in the respective info buttons as well as in the search help
Under Input and Search Help you will find further information on functions such as truncation or Boolean operators that adjust the hit list when a new search is performed.