Perhaps you should try some spelling variations:
"fop petruv OR peruuv OR petro OR pero OR petri OR peri OR petruuo OR petr o.s.*" » "fop petruv OR peruuv OR petrov OR pero OR petri OR peri OR petruuo OR petr o.s.*" (Expand Search), "fop petruv OR peruuv OR petru OR pero OR petri OR peri OR petruuo OR petr o.s.*" (Expand Search), "fop petruv OR peruuv OR petro OR pero OR petri OR per OR petruuo OR petr o.s.*" (Expand Search), "fop peteruv OR peruuv OR petero OR pero OR peteri OR peri OR peteruuo OR peter o.s.*" (Expand Search), "fop petruuv OR peruuv OR petruo OR pero OR petrui OR peri OR petruuuo OR petru o.s.*" (Expand Search), "fop peruv OR peruuv OR pero OR pero OR peri OR peri OR peruuo 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 peruuv) OR ((((petro OR pero) OR (petri OR peri)) OR petruuo) OR petr)) o.s.*.