## 3 Methodology
### NAD Calculation Results
In the context of Vietnam's logistics industry being under pressure from increasing transportation demand, fierce competition, and sustainability requirements, choosing and prioritizing appropriate strategies is extremely important [52; 53]. Leading strategies, such as Applying green technology and Developing green warehouses, should be focused on immediately, as they bring about quick positive impacts and are consistent with national policies on green growth. At the same time, strategies with low SF scores need to be invested in further research, with coordination between businesses, governments, and international organizations to increase implementation efficiency in the future. This study demonstrated the effectiveness of the FAHP and NFAD methods in assessing sustainable logistics strategies in Vietnam, while highlighting the need to balance the three elements of TBL theory: economic, social, and environmental. Strategies such as \"Applying green technology\" and \"Developing green warehouses\" were highly appreciated for their feasibility and effectiveness, in line with the global development trend of greening the logistics industry. However, strategies such as \"Applying circular economy model\" and \"Emission management\" need more time to research and test to overcome challenges in cost and technology. These results are not only meaningful to the logistics industry but \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**SF** & **C1-1** & **C1-2** & **C1-3** & **C2-1** & **C2-2** & **C2-3** & **C3-1** & **C3-2** & **C3-3** & **C4-1** & **C4-2** & **C4-3** \\ \hline SSL-01 & 0.27 & 0.01 & 0.00 & 0.17 & 0.03 & 0.00 & 0.02 & 0.00 & 0.00 & 0.03 & 0.01 & 0.00 \\ SSL-02 & 0.27 & 0.02 & 0.00 & 0.08 & 0.02 & 0.02 & 0.03 & 0.00 & 0.00 & 0.03 & 0.00 & 0.00 \\ SSL-03 & 0.27 & \(-\)0.03 & 0.01 & 0.10 & 0.05 & 0.01 & 0.04 & 0.02 & 0.00 & 0.01 & 0.00 & 0.00 \\ SSL-04 & 0.23 & 0.00 & 0.01 & 0.16 & \(-\)0.02 & 0.01 & 0.01 & 0.03 & 0.00 & 0.02 & 0.01 & 0.00 \\ SSL-05 & 0.11 & \(-\)0.01 & 0.02 & 0.11 & 0.02 & 0.01 & \(-\)0.10 & 0.01 & 0.00 & 0.04 & 0.01 & 0.00 \\ SSL-06 & 0.18 & \(-\)0.18 & 0.01 & \(-\)0.02 & 0.04 & 0.01 & 0.05 & 0.01 & 0.00 & 0.02 & 0.00 & 0.00 \\ SSL-07 & \(-\)0.08 & 0.00 & \(-\)0.05 & 0.09 & 0.03 & 0.00 & 0.06 & 0.03 & 0.01 & 0.00 & 0.00 & 0.00 \\ SSL-08 & 0.19 & 0.03 & 0.01 & 0.06 & 0.04 & 0.00 & 0.04 & 0.03 & 0.01 & 0.02 & 0.00 & 0.00 \\ SSL-09 & 0.13 & 0.00 & \(-\)0.04 & 0.09 & 0.04 & 0.01 & 0.03 & 0.02 & 0.00 & 0.03 & 0.00 & 0.00 \\ SSL-10 & \(-\)0.14 & \(-\)0.04 & 0.02 & 0.20 & 0.04 & 0.00 & 0.05 & 0.01 & 0.01 & 0.03 & 0.00 & 0.00 \\ SSL-11 & 0.29 & \(-\)0.01 & \(-\)0.01 & 0.00 & 0.03 & 0.01 & 0.03 & 0.02 & 0.00 & 0.02 & 0.00 & 0.00 \\ SSL-12 & 0.16 & \(-\)0.14 & \(-\)0.01 & 0.13 & 0.04 & 0.01 & 0.05 & \(-\)0.05 & 0.01 & 0.02 & 0.00 & 0.00 \\ SSL-13 & 0.23 & 0.02 & \(-\)0.03 & 0.08 & 0.04 & \(-\)0.01 & 0.04 & 0.01 & 0.00 & 0.02 & 0.00 & 0.00 \\ SSL-14 & 0.25 & \(-\)0.14 & \(-\)0.01 & 0.17 & 0.00 & \(-\)0.03 & 0.06 & 0.03 & 0.00 & 0.04 & 0.01 & 0.00 \\ SSL-15 & 0.10 & 0.07 & 0.02 & 0.12 & 0.02 & 0.02 & 0.00 & 0.01 & 0.00 & 0.02 & 0.01 & 0.00 \\ \hline \hline \end{tabular}
\end{table} 
Table 13: The value of SF. also provide an assessment method that can be applied to many other industries and fields, helping to promote sustainable development. The FAHP and NFAD methods have played an important role in ranking and evaluating sustainable strategies in the logistics industry in Vietnam. FAHP helps determine the weights for important factors, such as cost, feasibility, and environmental impact, thereby creating a quantitative basis for comparing strategies. After determining the weights, NFAD calculates the SF (Synthesis Fuzzy) value for each strategy, helping to determine the overall feasibility and impact. Strategies such as Applying green technology and Developing green warehouses have the highest SF, indicating feasibility and effectiveness in promoting sustainable development.