Perhaps you should try some spelling variations:
"fop petrov OR peruuv OR petris OR petru OR petri OR peteri OR petr OR petro o.s.*" » "fop petrov OR peruuv OR petris OR pentru OR petri OR peteri OR petr OR petro o.s.*" (Expand Search), "fop petrov OR peruuv OR petris OR petru OR petri OR peterdi OR petr OR petro o.s.*" (Expand Search), "fop petrov OR peruuv OR petris OR petru OR petri OR peter OR petr OR petro o.s.*" (Expand Search), "fop petrov OR peruuv OR petris OR petru OR petri OR peters OR petr OR petro o.s.*" (Expand Search), "fop peterov OR peruuv OR peteris OR peteru OR peteri OR peteri OR peter OR petero o.s.*" (Expand Search), "fop perov OR peruuv OR peris OR peru OR peri OR peteri OR per OR pero 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 (((petrov OR peruuv) OR petris) OR ((petru OR (petri OR peteri)) OR (petr OR petro))) o.s.*.