For example I used
http://blindsearch.fejus.com/ to search for "opera oslo".
It's a tricky question because there is browser company (Opera) based in Oslo together with a very modern and beautiful Opera House building.
With "opera oslo" I may have searched for:
1. the browser company Opera in Oslo
2. about the opera in Oslo (looking for exhibitions)
3. about the architecture of the building itself
The results for
Bing:
1.
http://www.operaen.no
official site of the Opera House company, where you can see their program and buy tickets
2.
http://www.oslooperahouse.com/
official site of the Opera House (building)
3.
http://en.wikipedia.org/wiki/New_National_Opera_House_(Oslo)
wikipedia page
then you get 3 results from architecture websites.
at the end 1 link to expedia (for hotels near the Opera House in Oslo)
Last link is for a 1 year old newpaper article about a concert.
lets see
Google
1.
http://www.operaen.no
official site of the Opera House company, where you can see their program and buy tickets
2.
http://www.operaen.no/Default.aspx?ID=934
the same as #1!!! (but in english instead of Norwegian)
3.
http://en.wikipedia.org/wiki/Oslo_Opera_House
wikipedia
4.
http://www.oslooperahouse.com/
official site of the Opera House (building)
5.
http://www.youtube.com/watch?v=bWSJtBzK9qE
YouTibe belongs to Google... that's why is the only one linking it
at the end 3 links to website for booking hotels (incidentally all for the same hotel, and a rather crappy one to my taste, but rather near to the building itself)
Finally
Yahoo is the most diverse...
1.
http://www.oslooperahouse.com/
Official website of the Opera House (building)
2.
http://www.arcspace.com/architects/snoehetta/oslo_opera/oslo_opera.html
architecture website
3. hotel booking website (the same hotel as google)
4.
http://en.wikipedia.org/wiki/New_National_Opera_House_(Oslo)
followed by 3 links to hotel booking (again the same hotel btw)
and at the end a link to a rather old news article about the cost of building the building
All 3 fail to find Opera the browser company (that would have appeared multiple times if you searched "opera" without the word "oslo" next to it.
You can choose by yourself which search engine was the best in this case.
Probably if you are not living in Oslo and just looking for a trip there from USA maybe Yahoo is good... but for my taste is a bit too commercial oriented.
Google and Bing are pretty much the same, but Google waste the list with a double link to the same page.
Obviously this is just one experiment, more search are needed to decide which search engine is best for you.
But you can try yourself