Your sentence is perfectly grammatical as far as we know, and you are correct in omitting those words. Other valid ways to phrase the infinitive are hind wah koraav, hind koraava and rarely hinda koraav. Known canon contains no word meaning 'which' nor a sentence with such a structure, so following English in this regard is justified.

Sentence structure and ommitance is good. 

Great, thank you very much for your help. :)