There are three ways to resolve your issue;
- Instead of passing in Singapore as an adminDistrict (i.e. state/province), pass it in using the locality property (city). Alternatively pass it in to both of those properties.
- Remove the postal code from the query.
- Instead of using a structured address, pass in your address as a query. This is recommended in the best practices and greatly increases the odds of a correct result being found: https://msdn.microsoft.com/en-us/library/dn894107.aspx