Useful articles:
Using KQL for query
Search
keywords: https://msdn.microsoft.com/en-us/library/office/ee558911.aspx
For more
information refer to the article at https://msdn.microsoft.com/en-us/library/office/jj163876.aspx
information refer to the article at https://msdn.microsoft.com/en-us/library/office/jj163876.aspx
Using KQL for query
Search
keywords: https://msdn.microsoft.com/en-us/library/office/ee558911.aspx
FQL can also be used, but some configuration is needed:
https://msdn.microsoft.com/en-us/library/office/jj163973.aspx
Query for managed metadata http://www.techmikael.com/2014/03/s15e01-kql-basics.html
A useful search tool: https://sp2013searchtool.codeplex.com/