def METHOD_NAME(self, search_string, search_string_separators=None) -> typing.List[str]:
    """
    :param search_string: a list of coma-separated keywords
    :return: a list of str (each keyword = 1 entry
    """
    search_string_separators = search_string_separators or SEARCH_SEPARATORS
    keywords = []
    if search_string:
        keywords = [
            keyword.strip() for keyword in re.split(search_string_separators, search_string)
        ]
    return keywords