Google search tips are provided in one of my earlier posts.

Following are some search tips for Gmail messages.

Searching based on E-Mail Headers:

a) use to:{emailid} or to:{contactname} for searching emails that you sent for a specific person.
Ex: to:jacob@gmail.com or to:chetan
b) use from:{emailid} or from:{contactname} for searching emails that are from a specific person.
Ex: from:sjoe@yahoo.com or from:San
c) use subject:{text} for searching emails which has subject
Ex: subject:resume
will list out all emails which have subject resume.
Similarly you can search for bcc: or cc:

Searching for Attachments:

a) use has:attachment , to search all email messages which have attachments attached to them.
b) use filename:doc , to search for email messages with attachments and the attachment file name contains doc.
c) you can combine both searches.
Ex: has:attachment filename:pdf

Searching based on Date:

Searching based on date requires you to put date format in yyyy/mm/dd
a) after:2009/02/09 will search for all emails after 09 Feb 2009, but not on the date.
b) before:2009/02/09 will search for all emails that came before 09 Feb 2009, but not on the date.

Boolean operators can also be used while searching in Gmail.
Ex: to:Dany subject:(stocks|news)
above search query searches for emails which are sent to Dany and with subject messages either stocks or news.

Gmail searching by default excludes Trash and Spam messages, if you want to include these folders, use in:anywhere with your search query.
Ex: from:Dany in:anywhere

1) To get current time in any city anywhere in the world. Simply type time <cityname>
   Ex: time hyderabad or time sanfrancisco

2) Google’s search box can be used as calculator. Simply type calculation you want, and click on search, you will be presented with result.
   Ex: (5+4)/2*25/23*12.23=

3) To know more about recent earthquake activity around the world. Simply type ‘earthquake’ in searchbox. If you want earthquake of a city, type earthquake <cityname>.
  Ex:  earthquake tokyo 

4) Google can also be used to convert between Unit of Measurements.
   Type “20m in ft” you will get the answer.
   Ex: 130 sq yds in sq ft or 130 sq yds to sq ft

5) To find definition of any word. Simply Type define:<word>, you will get definitions of the word from online dictionaries across web.
   Ex: define:web or define:change or define:information

6) Google also provides currency conversion information. Type “100INR to USD” in search box. You will be presented with conversion result.
   Ex: 100 GBP to USD

7) Looking for a map of any city. Type city name followed by keyword ‘map’.
   Ex: Hyderabad map
   or
   Mountain View map

8 ) To find related sites that have similar content. Type related: followed by <site name>.
   Ex: related:cnn.com

9) Google ignores common words such as and, or, the, what, who etc. If you want common word to be included in search, use ‘+’ sign followed by common word.
   Ex: Obama +and socialist

10) If you don’t want certain words to come in your search results, just put ‘-’ sign before the word, then google excludes this word from search result.
    Ex: obama -twitter

11) By putting phrases(“”) around any word, you can restrict google search for exact word and in the same order.
    Ex: “Barack Obama”
    In search results, whole word “Barack Obama” will be high lighted. If you remove phrases then you will see search results containing either Barack or Obama or both words.

12) Google search allows you to search in a particular site. use keyword ’site:’ for this purpose.
    <searchword> site:<sitename>
    Ex: Obama site:cnn.com
    will search for word ‘Obama’ in cnn.com
    Ex: twitter site:.in
    will search in all indian sites for word ‘twitter’.
 
13) If you are webmaster or site owner and want to know, how many URLs of your site are indexed by Google, use site keyword followed by your site name.
    Ex: site:creativeslab.net

14) And last but not least simply type your name or name of the person you just met in Google search box. You will be presented with web page search results of that person.