James Donnellan and Sarah McGann from Athenry county Galway

My great grandparents, James and Sarah Donnellan/Donelan, had 9 children of which the youngest was my grandmother, Nora Teresa Donelan.  She married Mike Fitzmaurice in Cleveland Ohio USA in 1928..                                                                                                                                                                                                                                                                                          They are my brick wall!    A marreige cert or their birth certs have been hard to find.  Any help would be appreciated  A search on irishgenealogy.ie today produced no info on either James or Sarah.                                                                                                Thank you for you great work......Theresa Fitzmaurice