An address you enter will often generate a map with the notification: "That street could not be found, but here is the city" and it will show you a general map of the area with lots of street lines but no street names. Don't give up. That's because the address is not a major street and it's in a populated area with tons of little streets which can't be detailed in the top level view.

If you know the general area of the street you're looking for, click the ZOOM IN arrows until the map gets more and more precise, and you'll see street names appearing. Then click the East, West, North, South arrows to move around this enlarged view.