Read the passage and answer the questions

IV. Read the passage and answer the questions: (2 points)
VIETNAM: Struggling to attract international students
Vietnam is changing university enrolment requirements to make it easier for foreign students to study at its universities. Previously, foreign students were required under Vietnamese law to take university entrance examinations in Vietnamese, making it difficult if not almost impossible for non-Vietnamese-speaking foreign students to apply. International student enrolment is one of the criteria to rank Vietnamese universities. Attracting foreign students is also a way for Vietnam to promote Vietnam's education to the world. The leading institutions also enrol undergraduate and graduate international students every year. Most are from the Asia Pacific region including China, Japan, Korea, Australia, Laos, Cambodia and Thailand, while a few come from the United States and Europe. Most of them study Vietnamese studies, Vietnamese literature or South East Asian studies, which makes Vietnam the best destination for them.
The leading institutions such as VNU-Hanoi and VNU-Ho Chi Minh, which have a tradition of hosting international students, run preparatory courses in Vietnamese for foreign students. However, it's widely recognised that if they do not have programmes taught in English, they do have a challenge to enrol international students.
1. Why was it difficult for foreign students to study at Vietnamese university?
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2. What is the role of international student enrolment for Vietnamese universities?
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3. What majors do they study?
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4. What should the leading university in Vietnam do to attract more internationa students?