Rich Snippets not showing in search results

If the rich snippets are not showing in the search results, the problem might occur due to the snippets you are using. 

You can validate your scheme using Google rich schema validator here: https://search.google.com/structured-data/testing-tool

Visit the above link, and enter the schema, and click on validate.

Also, you must keep in mind that it is completely up to Google, to index the schema or not. So, even if the schema is valid, may choose not to show the content, maybe for various reasons.