How do I go about looking for a long lost and unknown relative based on the date of birth, location and last name?

My girlfriend is adopted but was born in Ramnicu Valcea, Romania in 1995 and for a big ol' surprise I wanted to produce the name of her long lost sister or, if I'm really lucky, a picture. I need to know how I may go about doing this, and please understand, I'm not loaded.
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