Shana,
Thank you very much for answering. Duplicating the features does help. I found geoprocessing tool "composite locator" solved my alternate building names problem.
However, I have also tried entering Supported Language Codes column referenced in the Geocode coverage in the past but they are two-letter words where three-letter words are required for the Geoprocessing tool.
E.g. I have to input ENG in the language code field instead of EN as suggested in the page.
In fact, I have no idea what aspect does the language code affect and I cannot determine whether my language code is correct or effective.