Commercial arbitration is a very flexible method of dispute resolution under several aspects. However, this flexibility raises concerned matters of law application to the arbitration agreement, arbitration proceedings, dispute contents etc. It deserves the concerns to the delimitation of cases or contents, for which the parties may agree to select the applicable law and those that the parties may not select the applicable laws. In addition, another concern should also be raised: For the cases where the parties are not allowed to choose the applicable law and in cases where the parties in the option but have not selected the applicable law, whether the arbitrator has a must to apply the conflicting code to determine applicable law like the courts? When applying the law to settle the disputes, who must prove the content of the law and whether the arbitration must take into account public order, and if so, the public order of which country? Vietnam’s commercial arbitration regulations do not seem to pay adequate attention to the international aspects of the disputes that can be resolved by arbitration, so there is no or no satisfactory answer to the above questions