Forbidden Keywords:
There is no such thing as a list of forbidden keywords that search engines match against while performing a search. If there were, then it would be simple; you would know which words are unacceptable.
If you try to perform a search (not a safe search, just a search) using as keywords some vulgar expressions you will retrieve an amazing number of search results. Of course, if you use any filtering software that prevents you from getting vulgar results, you will not have the chance to visit these sites, but this is not the point.
The point is that, while there are no officially announced mechanisms that search engines use for filtering inappropriate keywords, there is enough room for censorship and manipulation of any kind.
Politically incorrect keywords, for example, are another often discriminated-against category of search keywords. Well known are the censorship/filtering issues in China, Saudi Arabia, and North Korea. The so-called “Great China Firewall” encompassed thousands of keywords that, when found on a page, prevented it from opening.
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