I want to use google.com instead of google.com.hk as my default search engine in Chrome. I tried to use custom search engine, but they all break search suggestions, not even something like

https://encrypted.google.com/search?q=%s&{google:RLZ}{google:acceptedSuggestion}
{google:originalQueryForSuggestion}{google:assistedQueryStats}
{google:searchFieldtrialParameter}sourceid=chrome&ie={inputEncoding}

which include parameters like acceptedSuggestion that seems to imply seach suggestions being enabled. But no, search suggestions still don't work.

In addition. some websites suggest editing Local State file under Chrome's setting folder. I already tried that, and it didn't work at all.

So, is there any way to use google.com as default search engine without breaking search suggestions?