[1] PolyMeta is an advanced Web 2.0 meta-search (federated search) and clustering engine. It enables organizations and individuals to simultaneously search diverse information resources on the Web with a common interface. The search results are merged, ranked and presented in relevance order.
[2] www.polymeta.com

Choose Select Sources and check all the search engines below.

Google
Yahoo
Ask
Exalead
AllTheWeb
GigaBlast
Cuil
Bing

Also, try out the [3] AllPlus Meta Search and Discovery Engine which is based on PolyMeta.
[4] www.allplus.com

With [5] Zuula, it is quick and convenient to get results from all the top search engines. Search engines often return very different results for the same terms. Currently, it offers Web, Image, Video, News, Blog, and Job searches and provides the results from your favorite search engine unaltered, so you can check those first and then get results from other search engines simply by clicking on their tabs.
[6] www.zuula.com

Choose Preferences to pick all the search engines. Set your results to 60 per page

Google
Yahoo
Bing
Gigablast
Exalead
Alexa
Entireweb
Mahalo
Mojeek

Try this sample search string: +”top secret/sci” +clearance resume OR “my resume” OR vitae -recruiter -job -jobs -submit -apply -”looking for” -recruiting -hiring -send -”email to” -”email resume” -opening -”to resume”