Use words likely to appear on the pages you want 

USE [ Idaho luxury hotel ] 
NOT [ a fancy place to stay in Idaho ]

USE [ tutorial ] [ introduction ] or [ overview ]
NOT [ help ]

Be specific 

USE [ antique metal soldiers ] 
NOT [ old toys ]

Be brief 

Google limits your query to 10 words maximum
For best results, use a few very precise words

Use the uppercase term OR to create logical choices

[ lemur relocation program OR programs ] 
[ vacation rental Oahu OR Maui ]

Use a minus sign ("-") to show only pages without specific words (do not include spaces)

[ green jaguar –football ]

Google ignores some common words. To force inclusion, use a "+" (do not include spaces) 

[ +in +and out ]

To find only pages with a set of words in a specific order, put them in quotes 

[ "to be or not to be" ]

Site: restricts your search to a specific site or domain and can be used to eliminate commercial results from your query

[ research fellows site:IBM.com ]
[ allergies site:.edu ]
[ volunteering site:.org ]
[ 1040 site:irs.gov ]

Use link: to see what sites link to a specific page

[ link:googlestore.com ]

Use info: for links to more info about a page (e.g., pages that mention the URL)

[ info:google.com ]

Enter an address with city and state or zip code for a link to a map

[ 2400 Bayshore Mountain View CA ]

Search specialized areas like Google Groups for advice and suggestions or Google Images for photos