Perhaps you should try some spelling variations:
"fop petrov OR petri OR petroio OR peroio OR petruiio OR petr OR peter o.s.*" » "fop petro OR petri OR petroio OR peroio OR petruiio OR petr OR peter o.s.*" (Expand Search), "fop petruov OR petrui OR petruoio OR peroio OR petruuiio OR petru OR peter o.s.*" (Expand Search), "fop petroov OR petroi OR petrooio OR peroio OR petrouiio OR petro OR peter o.s.*" (Expand Search), "fop perov OR peri OR peroio OR peroio OR peruiio OR per OR peter 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 (petrov OR ((petri OR ((petroio OR peroio) OR petruiio)) OR (petr OR peter))) o.s.*.