[Koha] (no subject)

Hi team... Kindly help me sort out this: When I search for an item on the OPAC without specifying if I want to search by title, call number, barcode number etc it show no results have been found but if I specify either the title, call number, barcode etc it shows the item... How can I sort this such that it searches without having to click on the drop down box to choose the search option?