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Abstract
Air pollution and depletionof fossil fuel which is used for internal combustion engines are two sensitive concernsinthe world. Facing to the increasing demands of social economy, this fuel source is being quickly withdrawn. Besides, the emissionsfrom combustions are causing global problems such as greenhouse effect, ozone depletion, acid rain and dangers to the environment. One of alternative fuels that do not contain carbon has been studied and widely used can be refered as hydrogen (Brown gas). An important feature is that product of hydrogen burning is only water (H2O), so it is called the ideal clean fuel. The technology solutions using hydrogen are collectively and known as HHO technology. Based on the analysis of the HHO application methods in the world, the paper would propose the most feasible solution on using HHO technology for the existing Vietnamese fleets.