Using operators

Google understands a range of operators that include filetype: (eg doc, xls, or pdf), intext: and allintext:, intitle: and allintitle:, inurl: and allinurl:, author: (in Google Groups) and location: (in Google News). Google also understands a logical OR, provided it is upper case. The OR command can be shortened to a vertical bar (|), as in outsourcing Calcutta | Kolkata or the traditional way - outsourcing Calcutta OR Kolkata.