Wordss fail me when I try to express my heartfelt gratitude to the help you rendered me.

我无法用言语当我尝试你渲染我的帮助表示衷心的感谢。

youdao

I deeply appreciate your courtesy and we hope to have the opportunity of rewarding you rendered me.

我非常感谢你的好意，并希望有机会回报你。

youdao

I take this opportunity to express to you my deep appreciation for the kind assistance you rendered me.

我借此机会对你所给予我的帮助表示深深的谢意。

youdao