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Hi pankajdubey

Actually this won't search the skyscript site, it will search any site which has the key words (from your example):
"skyscript.co.uk", "void", "of", "course"

If for example, someone happens to mention skyscript on another website it would also show up on this search. An example of that happens on page 4 of your search link that you list.

If however you truly want to just search skyscript you can do it like this:

site:skyscript.co.uk void of course

This tells google only to search the skyscript site for those search terms.