First of all, even though the link is gone, you can still access this service by clicking on the gear in the upper right hand corner of Google next to "Sign in." Advanced search is on the drop down menu. So really the only change is two clicks instead of one.

Well, you can! Just wrap your search query or question in double quotes like “your question goes here.” By doing so, you activate Google's deep search mode, ensuring that all the results include pages containing every single word or phrase you enclosed in quotes.