All but one of the extant, 17th-century Christian works written in chữ Nôm can be positively attributed to Maiorica. These works are seen as a vital resource for research into chữ Nôm, as well as historical dialects, vocabulary, and phonology of Vietnamese. To translate Catholic theological concepts, Maiorica favored plain, commonly understood vocabulary over Sino-Vietnamese vocabulary, even in cases where the latter would have been consistent with the terms used by his Jesuit colleagues in China. For example, he referred to God as (literally, "Virtuous Lord of Heaven and Earth") instead of and to the Eucharist as ("Holy Body") instead of . (Today, and are the preferred terms, respectively). Many of the terms he coined would later become popular, such as (passion), (salvation of souls), (to believe, appearing in the creeds), (humility and submission), (eternal life), (hallowed, appearing in the Lord's Prayer), etc.
