Dua al-Karb [Dua of Difficulty]…
Sh. al-Nabahani said:
He (Allah bless Him and give Him peace) would supplicate (make dua) at the time of difficulty:
لاَ إِلَهَ إِلاَّ اللَّهُ الْعَظِيمُ الْحَلِيمُ لاَ إِلَهَ إِلاَّ اللَّهُ رَبُّ الْعَرْشِ الْعَظِيمِ لاَ إِلَهَ إِلاَّ اللَّهُ رَبُّ السَّمَاوَاتِ وَرَبُّ الأَرْضِ وَرَبُّ الْعَرْشِ الْكَرِيمِ
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Sh. al-Lahji in his commentary (3/197-198) mentions:
Imam Ibn Jarir said: The early muslims (salaf) would supplicate with it and would call it ‘Dua al-Karb’ (the supplication of difficulty). Even though it is a dhikr, it is like a supplication (dua), due to the narration: ‘Whoever is busied by my remembrance from asking me, I give him that which is better than that which I give to the one who asks’
Benefit: Ibn Battal said: on the authority of Abu Bakr al-Razi: I was in Isfahan with Abu Nuaym, there was a Sheikh called ‘Abu Bakr’ who was the reference point for Fatwa. He was taken to the Sultan and imprisoned. In my sleep I saw al-Mustafa (Allah bless Him and give Him peace) with Gibril on His right, moving his lips continuously with glorification (tasbih). Al-Mustafa (Allah bless Him and give Him peace) said to me: Tell Abu Bakr to supplicate with the ‘Dua al-Karb’ which is in ‘Sahih al-Bukhari’ until Allah relieves him. I awoke and informed him, and he supplicated with it. It was only a short while before he was released. And the basis is a sincere intention.

Janab
I am in very dufficulties created by some one. Pleae Dua for me and also send me Dua to that I can read it for relief from difficulties.
Anwar