There are a variety of synonyms for the phrase "thus so." Some alternatives include "in this manner," "as a result," "therefore," "due to this," or "consequently." Each of these synonyms expresses a slightly different shade of meaning, but they all convey the idea of an outcome or consequence that follows logically from what has been said or done before. "Thus so" is a common phrase in formal writing, but using synonyms can help to avoid repetition and enhance clarity and precision. By selecting the most appropriate synonym for the context, a writer can ensure that their meaning is conveyed accurately and effectively to the reader.