Following are a number of back-translations as well as a sample translation for translators of Proverbs 15:11:

• Kupsabiny: “When things of death/ and the world of the dead are not hidden from God,
  then what can be said concerning what he knows about the thoughts of people?” (Source: Kupsabiny Back Translation)
• Newari: “If matters of death
  are not hidden from the Lord,
  how could matters of the human heart
  be hidden [from Him]?” (Source: Newari Back Translation)
• Hiligaynon: “If the LORD knows what is-happening in the place of the dead, much more he knows what is in the heart of man.” (Source: Hiligaynon Back Translation)
• Kankanaey: “If God has-ability to see everything in the place of the dead, for-sure he knows our thoughts.” (Source: Kankanaey Back Translation)
• English: “Yahweh knows what is happening in the place where dead people are,
  so he certainly knows what people are thinking.” (Source: Translation for Translators)