This trial tests if adding high doses of vitamin C to standard chemotherapy can better treat certain cancers that have returned or are resistant to treatment. The goal is to see if vitamin C makes the chemotherapy more effective at killing cancer cells. The study focuses on patients with specific types of lymphoma, CCUS, and CMML. High-dose intravenous vitamin C (IVC) has been explored for its potential to enhance the effectiveness of cancer chemotherapy, with some clinical evidence suggesting benefits, though rigorous data are lacking.