'endeavours of' is correct and usable in written English.
You can use it to refer to the efforts taken to achieve a goal. For example, "We are grateful for the continued endeavours of our volunteers."
The endeavours of the investigator appear to have been fruitless.
There is hope and imagination alongside the errors in the endeavours of those who are creative.
Artistic endeavours of any sort are a great way for me to do this.
The paper finally provides some suggestions for the design of assessments as endeavours of collective learning.
He lent vital encouragement and support to Rashīd al-Dīn's monumental world history and to the endeavours of Iranian poets.
The New Year honours are designed to recognise the good endeavours of British citizens, from the exalted to the ordinary.
Camus saw no dichotomy between the emptiness which lies at the heart of L'Etranger, and the endeavours of La Peste.
Partly due to the endeavours of people like Dang, Vietnam's city centres are unrecognisable from even a decade ago.
Assigning clear, singular and fixable motivations to the endeavours of jihadists is either a fool's errand or a charlatan's tactic.
Endeavours of the latter kind are currently receiving increased attention under headlines like "Structural Electronics" or "3D Electronics Printing".
The endeavours of the dynasties in the 9th and 10th centuries, though only partially successful with regard to the problem of Welsh unification, had important and lasting consequences.
