Improve Keyword search: allow advanced keyword that support operators and rules are like Google does

Improve Keyword search: allow advanced keyword that support operators and rules are like Google does.
- E.g:
+ Search for an exact word or phrase
+ Exclude a word
+ Fill in the blank
+ Search for either word
+ Searches for a single word or phrase in the title of the search result.

http://www.joomlart.com/forums/showthread.php?99388-possible-now-or-possible-features-request&p=427615#post427615