Opera is so much better in this regard: It checks your IP address’ location once during installation and sticks to it. You could manually update your Local State file from %appdata% should you wish to have another country set as default after installation.
For other browsers, I have also been using the NCR or No Country Redirection method to get Google to serve search results in English rather than the language based on my current location.
The main problem with this approach is that https://www.google.co.uk/ncr does not work, so you will have to cope with American search results from google.com instead of which many are useless unless of course you are actually from the United States.

I guess you should use https://www.google.com/ncr

So if I'm going to China my default search engine will become Baidu instead of Google?

Only if you install Opera there. Not sure if an update would do the same.

Thanks a lot.
If I install Opera when a VPN connection to US on, will it fix this issue?

Does Opera have different default search engines for different countries, eg Baidu for China?

Kinda of it.

So if I'm going to China my default search engine will become Baidu instead of Google?

Can I lodge this as a bug, most people in China who're using Opera are prefer another search engine other than Baidu.

Cheers,

Unless you want to convince Opera you're not in Australia, I really have no suggestion. I can tell you how to change your recognized location to the US (in fact, that's in the FAQ) which would make it use Google.com, but the default search engines for a given location can't be changed.

Hi Sgunhouse,

Thank you so much.
I changed the file according to the FAQ, and reboot, now it use Google.com.

What do you mean by "the default search engines for a given location can't be changed"?
Does Opera have different default search engines for different countries, eg Baidu for China?

Cheers,

Hi,

I'm living in Australia, I normally use google.com instead of google.com.au to search.
I will use google.com/ncr first time I use whatever browsers to make sure I will not be redirect to google.com.au when I use the browser built-in search field.

But this trick seems failed on Opera.
My OS is Windows 7 ultimate 64.
Opera version is 45.0.2552.225 beta.
My language settings in Opera is English(US).

If I use the search or web address field to search something, I will be redirected to google.com.au like this:
https://www.google.com.au/search?client=opera&q=test&sourceid=opera&ie=UTF-8&oe=UTF-8

If I enter google.com, it will go to the google.com because I went to google.com/ncr before. This page is like this:
https://www.google.com/#newwindow=1&q=test

Could anyone please tell me how to fix it?

Cheers,