Perhaps you should try some spelling variations:
"fop petruv OR petruov OR petro OR petrov OR petru OR perio OR petr o.s.*" » "fop petruv OR petruov OR petri OR petriv OR petru OR perio OR petr o.s.*" (Expand Search), "fop peteruv OR peteruov OR petero OR peterov OR peteru OR perio OR peter o.s.*" (Expand Search), "fop petriuv OR petriuov OR petrio OR petriov OR petriu OR perio OR petri o.s.*" (Expand Search), "fop peruv OR peruov OR pero OR perov OR peru OR perio 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 petruov) OR ((((petro OR petrov) OR petru) OR perio) OR petr)) o.s.*.