Compound sentences in Vietnamese grammar, also known as Câu ghép, are sentences that include two or more independent clauses. These clauses are usually linked with conjunctions like và (and), nhưng (but), hoặc (or), vì vậy (therefore). Each clause in a compound sentence could function as an independent sentence. Mastering compound sentences is an important part of enhancing fluency in Vietnamese, as it allows the learner to convey more complex thoughts and ideas.