Plot data for a range of years in Wolfram Alpha

I am trying to compare a bunch of statistics in Wolfram Alpha, but haven't been able to figure out how to configure the plot/graph:

For example, a search for population of Egypt vs Vietnam shows a plot of the entire population history. Is it possible to restrict it to a specific range? It does not seem to understand inputs such as:

• population of Egypt vs Vietnam, 1970-1990
• population of Egypt vs Vietnam, 1970..1990
• population of egypt vs vietnam, [1970..1990]
• (population of egypt vs vietnam)[1970..1990]

And others I have tried.