Perhaps you should try some spelling variations:
"fop petrv OR petruv OR petrov OR peterov OR petruo OR petrui OR peri OR petr o.s.*" » "fop petrv OR petruv OR petrov OR peterov OR petruo OR petrui OR petri OR petr o.s.*" (Expand Search), "fop petrv OR petruv OR petrov OR peterov OR petruo OR petrui OR per OR petr o.s.*" (Expand Search), "fop peterv OR peteruv OR peterov OR peterov OR peteruo OR peterui OR peri OR peter o.s.*" (Expand Search), "fop petriv OR petriuv OR petriov OR peterov OR petriuo OR petriui OR peri OR petri o.s.*" (Expand Search), "fop petruv OR petruuv OR petruov OR peterov OR petruuo OR petruui OR peri OR petru 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 ((petrv OR petruv) OR ((petrov OR peterov) OR ((petruo OR (petrui OR peri)) OR petr))) o.s.*.