Oanh - Hoang Hua, Van- Thi- Thanh Nguyen, Nam- Van- Ho Phan, Kiet- Khang Chung and Quyen- Hong- To Duong 2025. Study on the causal relationship and optimise the extraction procedure of herbal preparation from Herba Mimosae pudicae, Folium Erythrinae variegatae, Cortex Cinnamomi iners and Herba et radix Scopariae. Vietnam Journal of Science, Technology and Engineering. 67, 4 (Dec. 2025). DOI:https://doi.org/10.31276/VJSTE.2024.0102.