On your computer, go to Advanced Search: google.com/advanced_search. Under “Find pages with,” choose the query field/s to: Include exact words or a list of words in your results. Remove words from your results.

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.

Go to Google and type Type site: into the search bar. Type in the website's address without the www prefix. Press space and enter your search terms. Using the Chrome browser, type the website you want to search into the address bar.