Following are a number of back-translations as well as a sample translation for translators of Ecclesiastes 7:25:

• Kupsabiny: “But I turned/devoted my thoughts to discover how/what wisdom is and matters concerning many things. I also wanted to know the foolishness of sin and the confusion of stupidness.” (Source: Kupsabiny Back Translation)
• Newari: “So I put my mind to
  looking and searching for the reason behind wisdom.
  And it is my desire to understand
  why it is that evil and foolish things are crazy.” (Source: Newari Back Translation)
• Hiligaynon: “But I continue to study/learn and investigate, so-that I could acquire/obtain/possess wisdom and answer to my questions, and so-that I will-know how foolish is the man who does evil (thing) and how bad is the head of a man who does foolish- (thing).” (Source: Hiligaynon Back Translation)
• English: “But I decided to investigate things and
  by my wisdom try to understand the reason for everything.
  I also wanted to understand why people act wickedly
  and why they act very foolishly.” (Source: Translation for Translators)