Open web browser, type anything in address bar> PRESS ENTER.
It will search your desired text in default browser's search engine.
Only MS IE,EDGE has been set Bing Search engine as default.
On W10 phone: Open Edge Settings> Advance Settings. Under this, you can change your default search engine.
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If you think of your default search engine in the bottom right corner of the phone, it cannot be changed AFAIK, though I have read somewhere that if you set the region for Russia it changes to google.