According to the plan we've proposed, we will create a survey covering 12-15 questions and offers to the guests of Vinamilk (at the branch of Vinamikl) in order for them to fill in. The customer's answers in the survey will be the primary data. To avoid the case answers the question not so, we will send a few employees to stand in some place where we made a survey to make a small talk related to survey, to primary data brings authenticity and correctness over
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