The locations need to exist in OpenStreetMap - that’s my data source for cities/streets/etc.
I suggest adding places to the missing/broken city tracker - that’s my working document, so if it’s not in there it’s very unlikely to get added.
In addition to that - there are some helpful people in the forum that can add locations if they don’t already exist. Posting like you’ve done will help, but including specific names will be required - otherwise they’ll just be guessing. 
More general info is available in the #wiki category: About the Node, Street, and City Data