Perhaps you should try some spelling variations:
"fop petruv OR peruv OR periuv OR petrov OR pero OR petri OR petr OR per o.s.*" » "fop petru OR peruv OR periuv OR petrov OR pero OR petri OR petr OR per o.s.*" (Expand Search), "fop petruv OR peruv OR periuv OR petro OR pero OR petri OR petr OR per o.s.*" (Expand Search), "fop petruv OR peruv OR periuv OR petrov OR petro OR petri OR petr OR per o.s.*" (Expand Search), "fop petruv OR peruv OR periuv OR petrov OR pro OR petri OR petr OR per o.s.*" (Expand Search), "fop peteruv OR peruv OR periuv OR peterov OR pero OR peteri OR peter OR per o.s.*" (Expand Search), "fop petruuv OR peruv OR periuv OR petruov OR pero OR petrui OR petru OR per o.s.*" (Expand Search), "fop petrouv OR peruv OR periuv OR petroov OR pero OR petroi OR petro 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 peruv) OR periuv) OR (((petrov OR pero) OR petri) OR (petr OR per))) o.s.*.