you can search by surname, and year, or by year/month, but not by date range
It's possible to combine an address search by using the location field, and further name search by using the 'additional name' field - e.g. a partners surname for a marriage, or a father's firstname for a baptism etc.. the name search fields also search the witnesses and godparents.
Spelling of names varies so you would probably need to try variations such as Kehoe. Also bear in mind that Christian names were often record in Latin in RC registers
Shane