Google search (different countries/languages)

I was wondering about the use of google (or your prefered search website) in different languages by language learners.

In my case, I use google.com for english (could use .co.uk), google.pt for Portuguese, google.co.jp for Japanese and google.es for spanish (each spanish speaking country has a specific website, but I tend to use the “Spain version”).

How about you? When looking for content in your target language, do you use the website in your mother tongue or switch it to the target language.

*For those who never tried the diferent “versions” of search websites, I should say that the results differ (greatly) from one website to another. (Even Spain and Argentina whose language is the same, the results are quite different.)

I tend to use just use google.com for ease.

I get better results if I use google.de though

I generally use google.be.