Alright, but it really doesn't seem to me like fixing this issue for you would require breaking the search for bilingual people. There's gotta be so many better ways to resolve that.
Just so I understand the problem, is search now broken for bilingual people because they sometimes prefer search results in one locale/language and sometimes prefer other search results in a different one? I also speak Spanish (and some Dutch), but I can't think of any time I'd actively want to use their local-Google, even while I lived in the Netherlands.
As I understand it, English is your mother tongue. If so, that's probably why you don't have this issue.
For me, French is my mother tongue and I live in France. So, there's lots of things that I'd want to research that are specific to France (laws, culture, geography etc.) and then obviously, if you speak French fluidly, you get much more precise and detailed information for these in French texts.
If you're lucky, the English text is just a bad translation, but more often than not, the English text assumes that you must be some guy from a foreign country that really doesn't care about specifics and instead just wants an overview.
On the other hand, if I need to look up technical information or most international science, then English is the lingua franca, what gives you the best results in most cases.
In some cases, I'll even try both languages, just to make sure I'm not missing any useful information or to gauge which language gives better results (for example when a globally usable technology happens to be exceptionally popular in France).