Find What You Want on Google Search Precisely

Many of us use Google Search almost for finding any topic.But, we do little to find how to make our search more relevant.Google offers a collection of search facilities to make our search more relevant and accurate.

Phrase Searches
Google normally ignores common words such as 'and','how','what' etc., because, those words slow down the search process.So ,if we search for an exact phrase such as "cats and dogs" , we get results containing pages with cats and dogs terms separately but not the exact phrase.In order to get the exact phrase just mention the phrase in double quotes.
Ex:"cats and dogs".

Negative terms
If your search term has more than one meaning (for example: apple.Apple may mean a fruit or a computer or an iPod)you can focus your search by putting a minus sign ("-") in front of words related to the meaning you want to avoid.
Ex:apple -fruit.

"OR" search
To find pages that include either of two search terms, add an uppercase OR between the terms.
Ex:apple OR orange

Domain search
You can use Google to search only within one specific website by entering the search terms you're looking for, followed by the word "site" and a colon followed by the domain name.
Ex: rss site:http://meakkineni.blogspot.com

Numrange search
Search for results containing in a given range by adding two dots(..).
Ex:notebook $1000..$5000

Star search
If you remember only a part of your search term or if you are unclear about your search term or if you want to find a term which starts with or which ends with or is embedded between two unknown terms ,then you can use this star search.Just include a '*' wherever you are unclear
Ex:To find all blogs in blogspot use the search term *.blogspot

File type search
If you prefer to see a particular set of results with a specific file type (for example, PDF links), simply type filetype:[extension] along with your search terms. Google currently supports 12 file formats.
Ex: blog filetype:pdf (This query retrieves all pdf files containing blog term).

Source:Google Help