1. Search specific topics within double qoutation. example: "java programming".
2. Search the contents of a specific site using "site:-----". example:  <div> site:www.w3schools.com.




3. To get results similar to the topic use " ~". example: "java programming"~programs


4. Search for the specific document type using "filetype" . example: java filetype:pdf .

5. Seach  your area code via typing only first 3 digit. example:617.

6. To calculate just use the expression.example: 2*2.

7.Find definition of a word use "define".example:define:inheritance.