Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
magnālĭa, ĭum, n. [magnus], great things, mighty works or words (eccl. Lat.): sensit magnalia, Tert. ad Uxor. 2, 7: loquitur magnalia mutus, id. adv. Marc. 1, 54; Cypr. Ep. 58; Vulg. Act. 2, 11.