Create a search page like other search engines

Is it possible to search other blogs within a domain name on the same page? for example, I have 3blogs under subdomain name blog1.domain.com, blog2.domain.com, blog3.domain.com and I want to put a search box on the domain.com site which has 3 other options for visitor to search for. If they want to search something for blog2, they select blog2 then enter keyword, and so on…

Blog1 Blog2 Blog3