You can understand:
What you can do with level V4 Vietnamese
Many non-native Vietnamese speakers in international workplaces have this level of Vietnamese. A person working in Vietnamese at a V4 level will, however, lack certain nuances particularly outside his own field. He may also miss some of the subtleties and implied meanings in conversations.
Detailed Vietnamese skills of V4 level
In order to evaluate the Vietnamese language proficiency of students as well as their own self-assessment, a V4 level learner should have the necessary Vietnamese skills to:
Although progress will depend on each individual’s ability and the type of course, students can expect to reach level V4 with 600 hours of cumulative instruction.