## 1 Introduction  
At present, when the world is changing to a new era of the modern economy, Information and Communication Technology (ICT) will greatly contribute to the development of all countries [1]. The ICT industry is becoming an economic sector with a fast and sustainable growth rate, high turnover, and high export value, contributing significantly to the national GDP [2]. The total number of ICT enterprises nationwide in 2016 is estimated at 24,501 enterprises, increasing 13.13% compared to 2015. The total revenue of the ICT industry in 2016 is estimated at VND 1,500,009 billion VND (equivalent to 67.693 billion USD, up 11.49% as compared to 2015). ICT export turnover is estimated at 60.789 billion USD. The total state budget contribution is estimated at VND 34,320 billion (accounting for about 3.4% of the total state budget). Over the years, the impressive progress and efficiency of ICT for the entire economy, in which its impact on good work has also been recognized [3]. In 2018, the ICT Industry continued to contribute the largest proportion of the total revenue of the Information and Communication Industry with a rapid growth rate, high turnover, and high export value. ICT industry products and services are oriented to create a foundation of knowledge-based economic development, implement the Industrial Revolution 4.0, and contribute to mastering information systems, ensuring national security and national sovereignty; total revenue of ICT industry is estimated at 98.9 billion USD (91.5 billion USD in 2017), export is estimated at 94 billion USD [4]. In the past 10 years, Vietnam's ICT rankings have dropped to rank above 100, standing below the world average. Accompanying the Industrial Revolution 4.0 is one of the most important socio-economic developments of our time, the emergence of digital platforms (referred to as platforms) as a model. As a result, the Information and Communication Industry will have an increasing chance to develop their business. However, resources for development investment are limited, making the right investment decisions not only affect the direct benefits of investors but also affect the development of the industry [3]. One of the ways to make investment decisions is based on business results. From the manager's point of view, the study of business results is very important, being vital for the company and making decisions to change investment orientation [4]. Despite the importance of ICT, rare studies examining the performance of ITC companies are founded in literature. Instead, we found numerous studies exploring the impact of ICT on the performance of other aspects, such as service industries, manufacturing industries, energy efficiency, etc. Taking the importance of the ICT sector and its contributions to the national economy into consideration, there have been many studies examining the performance of this sector. In 1998, [PERSON] and [PERSON] conducted a study using DEA to evaluate the performance of telecommunication service in OECD countries [5]. The study of [PERSON] and [PERSON] [6] introduces an overview of the current trends in the telecommunications sector in Brazil. [PERSON] and [PERSON] [7] conducted a study comparing the operational efficiency of the main 19 European public telecommunications organizations while using Data Envelopment Analysis. In 2000, the study of [PERSON] and [PERSON] [8] analyses the change in production efficiency of Greek telecommunication sector. The same topic was studied by [PERSON] [9], which examined the change in production efficiency of local telecom companies in America by applying DEA. [PERSON] and [PERSON] conducted the efficiency measurement of mobile telecom subscriber [10]. Study of [PERSON] [11] measured the productivity efficiency of 39 leading global telecom operators by using DEA. [PERSON] [12] studied the international competition of information and communication technology (ICT) industry by adopting DEA to evaluate the performance of the top 50 ICT companies.