Pham Thi Bich Thu and Trinh, T.P. 2026. IMPROVING THE CONTROL OF SERVICE DELIVERY – CASH COLLECTION CYCLE AT THE BUSINESS CENTER – VNPT THANH HOA. Hong Duc University Journal of Science. 83, 1 (Jan. 2026), 50-62. DOI:https://doi.org/10.70117/hdujs.83.1.2026.889.