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