Google Removes Private Search Option
Speaking of advanced Search features, here's a screenshot from April 2013 that shows Google's Search filter menu. Only 4 out of the 9 features are still available: "visited pages", "**t yet visited pages", "reading level" and "verbatim". The dictionary feature has been replaced with an improved dictionary card, while the other features have been *******.
Here are the features that are still available:
The latest feature that has been ******* allowed you to restrict the results to "private" pages. The "personal"/"private" filter only included "content that was shared with you on Google+ or Gmail", as Google explains. You can hide personal results using the button next to the options dropdown, but you can ** longer display only personal results.