I want to find objects that we frequently see/use in trade show, what keyword shall i type in search engine?
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I think if I'm getting this right, you want to see examples of what a quality booth would look like at a trade show? I know of a company in San Diego that does incredible work called Exponents... www.exponents.com  then if you have a library card (sounds lame, stay with me) find the SIC code for a company and go to your library, go to Reference USA (you can actually go online to your library to reference USA, it's just not user friendly)  and run a "custom Search" based on your city and the SIC code and you'll have all of those businesses within your area.  If you don't care about the area, just run it on the SIC Code.  Hope this helps
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Look on ebay... active auctions and closed auction searches to see what items sold for.
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type...term papers...in a search engine.
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For your first question, just click on the icon that is showing in the top right hand corner(search engine icon). It will show a drag down list of the search engines that you have stored. Just select Google if you have it or else just add it.  As for the other one, I don't understand what you mean.
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You can user various online tools to select the relevant keywords for your site, you can try overture keyword suggestion tool or digitalpoint keywords sugesstion tools\nhttp://inventory.overture.com/d/searchinventory/suggestion\nhttp://www.digitalpoint.com/tools/suggestion/
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type it in a search engine
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search for item specific sites
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As the previous answerer hinted, a search engine is not a trivial piece of code. If you want to see the source of a Java open source search engine, hava a look at Lucene (http://lucene.apache.org/)
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I hear storys about people finding all kinds of old and cool stuff on E-bay.  Try a search I bet you're find something that you're looking for.
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to find eBay products go to www.ebay.com
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eBay might list something from time to time.  Set up a favorites search so you'll be notified when one comes up.
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On the Internet DUH! any search engine! Yahoo! Google.
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make sure you research keywords first.  See if anybody else is selling a similar item and see how they're positioned.  Think of it from the buyers standpoint - what would you search for if you were looking for one.\n\nMake your descriptions as detailed as possible and provide good images.  You'll sell anything on ebay.
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Google Zeitgeist\nSearch patterns, trends, and surprises according to Google \nhttp://www.google.com/intl/en/press/zeitgeist_monthly.html\n\nnot only managers, however, but what people are searching for via Google in U.S. and other countries.
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go here, it tells you how to in allthe popular search engines\nhttp://searchenginewatch.com/facts/article.php/2156041\nit is public knowledge what things people are searching for and how many, not illegal, just depends on whether the server wants to bother keeping a list
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it's there type it in any search engine and you'll find it
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I will sometimes go to ebay.com and put a search in for something, like what you are looking for, and see if I can find a match.  Sometimes you will get an idea of the value from what the auctions are being sold for.