For background, please see: Changes - July 2018
In all probability, if you get no results for your search, it is because you are searching for a complete or partial address, rather than a place name.
For example, "10 Downing Street, London" gives no results (addresses are no longer supported in the search function, due to Google's price hikes). "Westminster, London" does give a result (place names are supported).
We hope to be able to restore full address search in the future, once a viable solution has been identified.