AROUND() operator

It works like this

pizza AROUND(2) restaurant

pizza is maximally separated by two words from restaurant in the website text. So it is especially useful to find a word in a specific context.

http://www.techsupportalert.com/content/how-use-undocumented-operator-around-improve-google-searches.htm

For searching very specific scientific papers i use it in google scholar quite alot. One should use it with more other operators and words to make it effective, as AROUND doesnt work too well with to much results.