Perhaps you should try some spelling variations:
"fop petrov OR petriov OR petri OR petero OR peterov OR pero OR peteru OR petr o.s.*" » "fop peterov OR peteriov OR peteri OR petero OR peterov OR pero OR peteru OR peter o.s.*" (Expand Search), "fop petruov OR petruiov OR petrui OR petero OR peterov OR pero OR peteru OR petru o.s.*" (Expand Search), "fop petroov OR petroiov OR petroi OR petero OR peterov OR pero OR peteru OR petro 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 petriov) OR (((((petri OR petero) OR peterov) OR pero) OR peteru) OR petr)) o.s.*.