Perhaps you should try some spelling variations:
"fop petruv OR petro OR petru OR petri OR petruo OR peteruo OR peruo OR petr o.s.*" » "fop petruv OR petrov OR petru OR petri OR petruo OR peteruo OR peruo OR petr o.s.*" (Expand Search), "fop peteruv OR petero OR peteru OR peteri OR peteruo OR peteruo OR peruo OR peter o.s.*" (Expand Search), "fop peruv OR pero OR peru OR peri OR peruo OR peteruo OR peruo OR per o.s.*" (Expand Search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: fop (petruv OR ((((petro OR petru) OR petri) OR ((petruo OR peteruo) OR peruo)) OR petr)) o.s.*.