The two search options are set to use Google's "Safe Search" option, to help keep
the search focused on material for which you are potentially looking.
Example searches:
"snowy evening"
Find the specific phrase
snowy evening
Find the words (not necessarily next to each other)
criticism
What other people think
This will search google.com, but restrict it to the ketzle.com website:
This will search google.com and exclude ketzle.com:
[ http://www.google.com/ ]