3.1 method of obtaining documentsIn terms of collecting secondary material, students seeking documents related to the subject at the library and online. Secondary sources of information are guaranteed accurate, reliable. The material is used mainly for scientific research paper published in the prestigious magazine, master's thesis, doctoral theses with relevance, textbooks and articles summarizing the Scientific Conference. Information about the online services of the Government of Vietnam General Department of customs, was taken from the website of the Government, and the General Department of customs.On how to collect primary data, the data are collected by personal interviewing method. The content of the interview method will be presented here.
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