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Sure, you can always extend your visit in Vietnam!
You are normally given a one month single entry travel visa, which lasts about 30 days. You should need to make your plan at least 7 days before your visa is expired as it normally takes about 2 working days to get your visa extended, for another one month. For longer stay visas or extensions, it would take about 7 to 15 days to get.
There are also 3 month tourist visas available at a reasonable cost. Ask your visa provide about this option then you do not have to worry about extending your visa when you here. | 
