There are many reasons to try other search engines, but see if you can come up with your own. Here is a short list of 5 search engines with which to get started.
1) Giga Blast

"We've been around since 2000, and we launched the first version of our search in 2002. We quickly became known as a highly-efficient search engine with both broad and deep coverage of the growing Internet.”
http://www.gigablast.com/
2) Ms Freckles

"From the UK, MsFreckles.com provides an easy way to make professional searches for the ordinary Internet user. It also offers translation of a text, calculator, superfilter, blogsearch and more. The site is available in English, Swedish and Chinese (simplified).”
http://www.msfreckles.com/index.php?lang=en
3) Kart00

“KartOO is a metasearch engine with visual display interfaces. When you click on OK, KartOO launches the query to a set of search engines, gathers the results, compiles them and represents them in a series of interactive maps.“
http://www.kartoo.com/
4) Glimpsy

Type your request (e.g. buy books) and click to Find. You can begin with the phrase: I want to...
http://www.gimpsy.com/
5) Custom Search Engine

The directory of Google Custom Search Engines (CSE).
http://www.customsearchengine.com/