What is the best way to find people online?

I know their full name, their date of birth and the place of birth/country. I don't know anything else.

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Guys, the live in Portugal and not active on social media. I just want to know their email id or whatsapp number so I can get in touch with them somehow. Please tell me if somebody knows an effective way to find out someone's contact by their full name, date of birth, place of birth, living in Portugal. Please suggest if you can! I would be forever grateful.
What is the best way to find people online?
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