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Search Basics Search Tips : Yahoo Search Meta Words 
site: hostname: link: url: inurl: intitle:

Yahoo has many search tips...or designs

Choose Words smartly
try:  "19th century chairs"   instead of  "old furniture" 
use: "digital camera reviews"   instead of  "electronics" 

Make sure to watch for words with more than one meaning. 
If you're looking for information on modeling, 
make sure you specify "fashion" or "clay."
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Including and Excluding Words (+) (-)
Including Words: To include words, just type a plus sign + 
in front of each one. For example, If you want to see 
pages about the latest "in thing," search for "+in thing." 

Excluding Words: To exclude words, type a minus 
sign - in front of them. No pages containing those words 
will show up in your results. For example, if you want to 
see pages about dogs with no mention of poodles, 
search for "dogs -poodles." 
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Either/Or
If you're equally interested in two or more alternatives, 
use OR in capital letters. For example, search for 
"new zealand kayaking OR biking
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Word Order
Related Searches 

Yahoo! Shortcuts

Search Meta Words 
Here is a list of special keywords that give you results 
unique to that special keyword instruction. 
You can enter these Meta words directly into the 
Yahoo! Search box. 

site: use to find all documents within a particular 
domain and all it's subdomains. 
Example: site:yahoo.com 

hostname: use to find all documents from a particular host only. 
Example: hostname:autos.yahoo.co 

link: use to find documents that link to a particular url. 
Example: link:http://autos.yahoo.com/ 

url: use to find a specific document in our index. 
Example: url:http://edit.autos.yahoo.com/repair/tree/0.html 

inurl: use to find a specific keyword as part of indexed urls. 
Example: inurl:bulgarian 

intitle: use to find a specific keyword as part of the indexed titles. 
Example: intitle:Bulgarian

more reference:
http://help.yahoo.com/help/us/ysearch/basics/basics-04.html