Rebecca Masterton, Dr Rebecca Masterton graduated with a BA in Japanese Language and Literature; an MA in Comparative East Asian and African Literature and a PhD in Islamic literature of West Africa. She has been... Answer updated 12 months ago

www.duas.org has many for this. 'La hawla wa la quwwata 'illa billah' x 100 every day is good. There is also a powerful du'a from this website, as follows: 

يَا قَاهِرُ يَا قَهَّارُ يَا ذَا الْبَطْشِ الشَّدِيْدِ اَنْتَ الَّذِىْ لاَ يُطَاقُ انْتِقَامَهُ

yaa qaahiru yaa qahhaaru yaa dhal bat’shish shadeedi antal ladhi laa yut’aaqu intiqaamah.

“O forceful, O powerful. O One with a severe might You are the One whose retaliation none could bear.”

After this, you blow in the direction of your enemy.

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