Perhaps you should try some spelling variations:
"fop petrov OR petruuv OR petru OR pentru OR peteru OR petr OR peter OR petri o.s.*" » "fop petro OR petruuv OR petru OR pentru OR peteru OR petr OR peter OR petri o.s.*" (Expand Search), "fop petrov OR petruuv OR petru OR pentru OR peters OR petr OR peter OR petri o.s.*" (Expand Search), "fop petroov OR petrouuv OR petrou OR pentru OR peteru OR petro OR peter OR petroi o.s.*" (Expand Search), "fop perov OR peruuv OR peru OR pentru OR peteru OR per OR peter OR peri 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 petruuv) OR (((petru OR pentru) OR peteru) OR ((petr OR peter) OR petri))) o.s.*.