Perhaps you should try some spelling variations:
"fop petrv OR petruv OR petrov OR pero OR petru OR peru OR petri OR petr o.s.*" » "fop petrv OR petruv OR petrov OR pero OR petru OR per OR petri OR petr o.s.*" (Expand Search), "fop peterv OR peteruv OR peterov OR pero OR peteru OR peru OR peteri OR peter o.s.*" (Expand Search), "fop petrov OR petrouv OR petroov OR pero OR petrou OR peru OR petroi OR petro o.s.*" (Expand Search), "fop perv OR peruv OR perov OR pero OR peru OR peru OR peri 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 ((petrv OR petruv) OR (petrov OR (((pero OR (petru OR peru)) OR petri) OR petr))) o.s.*.