Perhaps you should try some spelling variations:
"fop petrov OR perov OR peruov OR pero OR pero OR petri OR peri OR petr o.s.*" » "fop petrov OR perov OR peruov OR pero OR pero OR petri OR per OR petr o.s.*" (Expand Search), "fop peterov OR perov OR peruov OR pero OR pero OR peteri OR peri OR peter o.s.*" (Expand Search), "fop petruov OR perov OR peruov OR pero OR pero OR petrui OR peri OR petru o.s.*" (Expand Search), "fop petroov OR perov OR peruov OR pero OR pero OR petroi OR peri 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 perov) OR peruov) OR (((pero OR pero) OR (petri OR peri)) OR petr)) o.s.*.