Read more here: http://booleanstrings.com/best-practices/
and take a look at the discussion here:
http://www.linkedin.com/answers?viewQuestion=&questionID=453593&askerID=1769200
Read more here: http://booleanstrings.com/best-practices/
http://www.linkedin.com/answers?viewQuestion=&questionID=453593&askerID=1769200