Use comma or space to separate words. (e.g. 22nd Street Bayonneas opposed to22ndStreetBayonne)
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Try entering the region (city and province or state or metropolitan area, etc.) that the place belongs to, even adding/removing the country sometimes makes the difference. (e.g. from Vancouver, BC to White Rock, BCas opposed to from Vancouver to White Rock)
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Provide a postal code (zip area) if you know it. (In some countries, like Canada and the UK, providing only the postal code could be enough to get the route)
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Check the spelling. (e.g. Ave or Avenueas opposed toavenu)
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It is always wise to get a "second opinion", so get the directions on at least two maps: (e.g. Google Maps and Bing Maps). One of them might not get it right while the other one does. Also, both could get it right, but it's optimal in only one of them.