I was trying my luck at writing macros for Live Search that I discovered this: the search query size restriction on Live.
In my macro, I included a lot of site lookups and on testing by providing user input the combined query didn’t show any results. By my guess, I reduced the site list, and the results appeared awesomely! :)
After a bit of looking into, I found out that the size of the search query for Live Search is not as great as Google’s!
I, first make a search for:
Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello Hello
on Live. The result looks like this:

Now, I append
Google
to the query. This must return the first search result as the Google word is included in it.
But I get this:

No result!
Even on trying the url the same no result appears!
http://search.live.com/results.aspx?q=Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Hello+Google
Here’s a screenshot to Google Search for the same query.

I suppose Live Search has a restriction on the size for the search text.