Perhaps you should try some spelling variations:
"fop petrov OR petroi OR peteriv OR petriuiv OR petero OR petr OR peter o.s.*" » "fop petro OR petroi OR peteriv OR petriuiv OR petero OR petr OR peter o.s.*" (Expand Search), "fop petrov OR petri OR peteriv OR petriuiv OR petero OR petr OR peter o.s.*" (Expand Search), "fop petrov OR petro OR peteriv OR petriuiv OR petero OR petr OR peter o.s.*" (Expand Search), "fop petrov OR petrow OR peteriv OR petriuiv OR petero OR petr OR peter o.s.*" (Expand Search), "fop petrov OR petroi OR peteriv OR petriuiv OR peters OR petr OR peter o.s.*" (Expand Search), "fop petrov OR petroi OR peteriv OR petriuiv OR petro OR petr OR peter o.s.*" (Expand Search), "fop petriov OR petrioi OR peteriv OR petriiuiv OR petero OR petri OR peter o.s.*" (Expand Search), "fop petruov OR petruoi OR peteriv OR petruiuiv OR petero OR petru OR peter o.s.*" (Expand Search), "fop petroov OR petrooi OR peteriv OR petroiuiv OR petero OR petro 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 ((petroi OR peteriv) OR petriuiv)) OR (petero OR (petr OR peter))) o.s.*.