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  duratyaya—very difficult to surpass    Madhya 20.121, Madhya 22.23, Madhya 24.138
  duratyaya—difficult to overcome.    SB 6.19.11
  duratyaya—very difficult to overcome    Bg 7.14
  duratyaya—very difficult to understand    SB 10.1.49-50
  duratyaya—very hard and firm    SB 10.3.48-49

Can't find any compound Sanskrit words containing duratyaya.

  duratyaya—difficult to understand    SB 8.3.29
  duratyaya—insurmountable or very difficult to cross    SB 7.9.43
  duratyaya—cannot be easily understood    SB 3.16.37
  duratyaya—very difficult to follow    SB 7.5.13
  duratyaya—very difficult    SB 8.3.6
  duratyaya-vikrantam—whose strength was insurmountable    SB 9.20.19