Search: "light-blue Widgets" vs. "Widgets lig

[katropa]

Google seems to serve up different SERP's for the following search phrases (without the quotes):

"light blue Widgets"
"light-blue Widgets"
"Widgets light blue"
"Widgets light-blue"

Why?

If I do the above on MSN & YAHOO I get the same SERP's.
However if I use the following Google Data Centres they dish up the same results as MSN and the SERP's stay the same.

http://216.239.53.99
http://66.102.7.99

How come?

I'm having trouble with the keyword "self catering" which can also be spelled "self-catering" or even "selfcatering".
Add a town/city name to the above and you'll see what I mean.

Any suggestions?

[katropa]

Anybody got some advice on the above?