Question: Even though I have signed in, cleared all cache/cookies [Google Instant](http://en.wikipedia.org/wiki/Google_Search#Instant_Search) still doesn't work for me. How can it be fixed?

[Edit]

The URL I use is [www.google.com.vn](http://www.google.com.vn).

I see the dropdown keyword suggestion list but the search result doesn't change when I select a new keyword.

I'm using Google Chrome browser with the default settings.

The strange thing is that I can use Google Instant at home while I cannot do this in my office!

Answer: 
From the [Google Instant FAQ](http://www.google.com/instant/) -

> 
> Google Instant is starting to roll-out
>  to users on Google domains in the US,
>  UK, France, Germany, Italy, Spain and
>  Russia who use the following browsers:
>  Chrome v5/6, Firefox v3, Safari v5 for
>  Mac and Internet Explorer v8. Please
>  note, users on domains other than
>  Google.com can only access Google
>  Instant if they are signed in to a
>  Google Account. We will continue to
>  add new domains and languages over the
>  next several months.
> 
> 
> 

If you are not seeing it, its likely that either Google Instant has not rolled-out in your country or you are not signed-in while searching or you may be using a browser that they don't support.
No longer works for [anybody](https://www.theverge.com/2017/7/26/16034844/google-kills-off-instant-search-for-mobile-consistency) (:.